Annual report pursuant to Section 13 and 15(d)

Stock Based Compensation (Details)

v3.20.1
Stock Based Compensation (Details)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Feb. 03, 2020
$ / shares
shares
Jan. 01, 2020
$ / shares
shares
May 18, 2016
USD ($)
shares
Feb. 29, 2020
shares
Aug. 31, 2019
shares
Apr. 30, 2019
shares
May 31, 2018
shares
Jun. 30, 2019
USD ($)
day
$ / shares
shares
Sep. 30, 2019
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Annual share reserve increase (as a percent)                     4.00%
Total stock-based compensation | $                   $ 2,462,796 $ 2,431,063
Fair value assumptions                      
Expected annual dividend yield                   0.00%  
Research and development                      
Total stock-based compensation | $                   $ 464,382 101,000
General and administrative                      
Total stock-based compensation | $                   1,549,844 2,135,710
Sales and marketing                      
Total stock-based compensation | $                   190,851 57,271
Total stock-based compensation, continuing operations                      
Total stock-based compensation | $                   2,205,077 2,293,981
Total stock-based compensation, discontinued operations                      
Total stock-based compensation | $                   257,719 $ 137,082
Service Based Options                      
Total stock-based compensation | $                   $ 2,000,000  
Option Activity, Number of shares                      
Balance, beginning of period (in shares)   4,180,606             3,746,597 3,746,597  
Granted (in shares)                   2,631,927  
Options exercises in period (in shares)                   (323,403)  
Forfeitures (in shares)                   (1,445,554)  
Expired (in shares)                   (428,961)  
Balance, end of period (in shares)                   4,180,606 3,746,597
Exercisable (in shares)                   2,228,748  
Option Activity, Weighted-average exercise price                      
Beginning of period (in dollars per share) | $ / shares   $ 4.80             $ 4.16 $ 4.16  
Granted (in dollars per share) | $ / shares                   5.70  
Exercised (in dollars per share) | $ / shares                   2.59  
Forfeitures (in dollars per share) | $ / shares                   5.22  
Expired (in dollars per share) | $ / shares                   4.99  
End of period (in dollars per share) | $ / shares                   4.80 $ 4.16
Exercisable (in dollars per share) | $ / shares                   $ 4.58  
Option Activity, Fair value of options granted                      
Grant date fair value of options granted | $                   $ 8,106,310  
Grant date fair value forfeitures | $                   4,218,136  
Grant date fair value of options expired | $                   $ 1,062,853  
Option Activity, Weighted-average remaining contractual term (in years)                      
Balance                   7 years 10 months 10 days 7 years 9 months 14 days
Exercisable                   6 years 9 months 25 days  
Aggregate intrinsic value | $                   $ 4,900,000  
Aggregate intrinsic value of options exercisable | $                   3,500,000  
Intrinsic value of options exercised | $                   1,000,000  
Fair value of options vested in period | $                   $ 2,200,000 $ 1,200,000
Per share weighted average fair value of options granted (in dollars per share) | $ / shares                   $ 3.08 $ 2.28
Options vested (in shares)                   983,644  
Vested (in dollars per share) | $ / shares                   $ 2.21  
Unrecognized compensation expense | $                   $ 4,500,000  
Unrecognized compensation cost period for recognition                   2 years 8 months 5 days  
Fair value assumptions                      
Expected stock price volatility                   55.00%  
Expected annual dividend yield                   0.00% 0.00%
Market Based Options                      
Total stock-based compensation | $                   $ (100,000)  
Option Activity, Number of shares                      
Balance, beginning of period (in shares)   300,000             500,000 500,000  
Granted (in shares)                   300,000  
Options exercises in period (in shares)                   0  
Forfeitures (in shares)                   (500,000)  
Balance, end of period (in shares)                   300,000 500,000
Exercisable (in shares)                   0  
Option Activity, Weighted-average exercise price                      
Beginning of period (in dollars per share) | $ / shares   $ 4.98             $ 4.24 $ 4.24  
Granted (in dollars per share) | $ / shares                   4.98  
Forfeitures (in dollars per share) | $ / shares                   4.24  
End of period (in dollars per share) | $ / shares                   $ 4.98 $ 4.24
Option Activity, Fair value of options granted                      
Grant date fair value of options granted | $                   $ 1,000,000  
Grant date fair value forfeitures | $                   $ 1,300,000  
Option Activity, Weighted-average remaining contractual term (in years)                      
Balance                   9 years 4 months 24 days 9 years 2 months 27 days
Aggregate intrinsic value | $                   $ 123,000  
Per share weighted average fair value of options granted (in dollars per share) | $ / shares                   $ 3.42  
Per share weighted average fair value of options forfeited (in dollars per share) | $ / shares                   $ 2.52  
Unrecognized compensation expense | $                   $ 800,000  
Unrecognized compensation cost period for recognition                   2 years  
Fair value assumptions                      
Risk-free interest rate                   2.32% 2.84%
Expected term of options (in years)                   10 years 10 years
Expected stock price volatility                   60.00% 60.00%
Expected annual dividend yield                   0.00% 0.00%
Restricted Stock                      
Award vesting period                   4 years  
Total stock-based compensation | $                   $ 500,000  
Option Activity, Weighted-average remaining contractual term (in years)                      
Unrecognized compensation cost period for recognition                   2 years 3 months 18 days  
Restricted Stock Award, Number of Shares                      
Nonvested restricted, beginning balance (in shares)   267,500             445,000 445,000  
Granted (in shares)                   295,000  
Vested (in shares)                   (172,500)  
Forfeited (in shares)                   (300,000)  
Nonvested restricted, ending balance (in shares)                   267,500 445,000
Restricted Stock Award Weighted Average Grant Date Fair Value [Abstract]                      
Beginning of period (in dollars per share) | $ / shares                 $ 4.27 $ 4.27  
Granted (in dollars per share) | $ / shares                   4.98  
Vested (in dollars per share) | $ / shares                   4.52  
Forfeited (in dollars per share) | $ / shares                   $ 4.24  
End of period (in dollars per share) | $ / shares                     $ 4.27
Restricted stock award unrecognized compensation expense | $                   $ 1,300,000  
Minimum | Service Based Options                      
Fair value assumptions                      
Risk-free interest rate                   1.47% 2.51%
Expected term of options (in years)                   5 years 5 years
Expected stock price volatility                     55.00%
Maximum | Service Based Options                      
Fair value assumptions                      
Risk-free interest rate                   2.59% 3.01%
Expected term of options (in years)                   6 years 3 months 6 years 3 months
Expected stock price volatility                     65.00%
2016 Plan                      
Increase in number of shares reserved for issuance (in shares)     600,000       1,400,000        
Common stock remaining for future issuance (in shares)                   2,532,162  
2016 Plan | Stock options                      
Award expiration period                   10 years  
2015 Plan                      
Common stock remaining for future issuance (in shares)     464,476                
2016 Second Amended Plan                      
Increase in number of shares reserved for issuance (in shares)         850,000            
Employee Stock Purchase Plan (ESPP)                      
Common stock remaining for future issuance (in shares)                   1,118,882  
Total stock-based compensation | $                   $ 200,000 $ 50,000
Restricted Stock Award Weighted Average Grant Date Fair Value [Abstract]                      
Percentage of fair market value on the lower of first day or last day of the offering period at which employees may purchase stock under the ESPP     85.00%                
Maximum portion of earning an employee may contribute to the ESPP Plan     15.00%                
Maximum annual amount of fair market value of the Company's common stock that a participant may accrue the rights to purchase | $     $ 25,000                
Shares of common stock for future issuance (in shares)     500,000                
Automatic increase to shares authorized as percentage of outstanding stock at end of preceding year     1.00%                
Employee | 2016 Plan | Minimum | Stock options                      
Award vesting period                   3 years  
Employee | 2016 Plan | Maximum | Stock options                      
Award vesting period                   4 years  
Director | 2016 Plan | Minimum | Stock options                      
Award vesting period                   1 year  
Director | 2016 Plan | Maximum | Stock options                      
Award vesting period                   3 years  
Terminated Executive                      
Total stock-based compensation | $                     $ 300,000
Terminated Executive | Option And Non Option Awards                      
Equity awards forfeited (in shares)           1,489,583          
Terminated Executive | Service Based Options                      
Option Activity, Number of shares                      
Forfeitures (in shares)           (689,583)          
Terminated Executive | Market Based Options                      
Option Activity, Number of shares                      
Forfeitures (in shares)           (500,000)          
Terminated Executive | Restricted Stock                      
Total stock-based compensation | $               $ (500,000)      
Requisite service period           2 years 9 months 18 days          
Restricted Stock Award, Number of Shares                      
Forfeited (in shares)           (300,000)          
Board of Directors Chairman | Market Based Options                      
Option Activity, Number of shares                      
Granted (in shares)               300,000      
Option Activity, Weighted-average exercise price                      
Granted (in dollars per share) | $ / shares               $ 4.98      
Board of Directors Chairman | Restricted Stock                      
Restricted Stock Award, Number of Shares                      
Granted (in shares)               250,000      
Vested (in shares)               (50,000)      
Subsequent Event | Inducement Option                      
Award vesting period       4 years              
Option Activity, Number of shares                      
Granted (in shares)       2,400,000              
Subsequent Event | 2016 Plan                      
Increase in number of shares reserved for issuance (in shares)   1,775,368                  
Shares available for issuance (in shares)   4,307,530                  
Subsequent Event | Employee Stock Purchase Plan (ESPP)                      
Increase in number of shares reserved for issuance (in shares)   443,842                  
Common stock remaining for future issuance (in shares)   1,562,724                  
Subsequent Event | Board of Directors Chairman | Service Based Options                      
Award vesting period 3 years                    
Option Activity, Number of shares                      
Granted (in shares) 500,000                    
Option Activity, Weighted-average exercise price                      
Granted (in dollars per share) | $ / shares $ 3.98                    
Tranche One | Board of Directors Chairman | Market Based Options                      
Option Activity, Weighted-average remaining contractual term (in years)                      
Award vesting rights percentage               33.33%      
Number of days above threshold to trigger vesting | day               3      
Tranche One | Board of Directors Chairman | Restricted Stock                      
Option Activity, Weighted-average remaining contractual term (in years)                      
Award vesting rights percentage                 33.33%    
Tranche One | Board of Directors Chairman | Minimum                      
Option Activity, Weighted-average remaining contractual term (in years)                      
Share price (in dollars per share) | $ / shares               $ 8.00      
Tranche One | Subsequent Event | Inducement Option                      
Option Activity, Weighted-average remaining contractual term (in years)                      
Award vesting rights percentage       25.00%              
Tranche One | Subsequent Event | Board of Directors Chairman | Service Based Options                      
Option Activity, Weighted-average remaining contractual term (in years)                      
Award vesting rights percentage 33.33%                    
Tranche Two | Board of Directors Chairman | Market Based Options                      
Option Activity, Weighted-average remaining contractual term (in years)                      
Award vesting rights percentage               33.33%      
Number of days above threshold to trigger vesting | day               3      
Tranche Two | Board of Directors Chairman | Restricted Stock                      
Option Activity, Weighted-average remaining contractual term (in years)                      
Award vesting rights percentage                 33.33%    
Tranche Two | Board of Directors Chairman | Minimum                      
Option Activity, Weighted-average remaining contractual term (in years)                      
Share price (in dollars per share) | $ / shares               $ 10.50      
Tranche Two | Subsequent Event | Board of Directors Chairman | Service Based Options                      
Option Activity, Weighted-average remaining contractual term (in years)                      
Award vesting rights percentage 33.33%                    
Tranche Three | Board of Directors Chairman | Market Based Options                      
Option Activity, Weighted-average remaining contractual term (in years)                      
Award vesting rights percentage               33.33%      
Number of days above threshold to trigger vesting | day               3      
Tranche Three | Board of Directors Chairman | Restricted Stock                      
Option Activity, Weighted-average remaining contractual term (in years)                      
Award vesting rights percentage                 33.33%    
Tranche Three | Board of Directors Chairman | Minimum                      
Option Activity, Weighted-average remaining contractual term (in years)                      
Share price (in dollars per share) | $ / shares               $ 13.00      
Tranche Three | Subsequent Event | Board of Directors Chairman | Service Based Options                      
Option Activity, Weighted-average remaining contractual term (in years)                      
Award vesting rights percentage 33.33%                    
Employee | Subsequent Event | Service Based Options                      
Award vesting period 4 years                    
Option Activity, Number of shares                      
Granted (in shares) 514,400                    
Option Activity, Weighted-average exercise price                      
Granted (in dollars per share) | $ / shares $ 3.98                    
Employee | Tranche One | Subsequent Event | Service Based Options                      
Option Activity, Weighted-average remaining contractual term (in years)                      
Award vesting rights percentage 25.00%                    
Employee | Tranche Two | Subsequent Event | Service Based Options                      
Award vesting period 36 months                    
Option Activity, Weighted-average remaining contractual term (in years)                      
Award vesting rights percentage 75.00%