Annual report pursuant to Section 13 and 15(d)

Capital Structure -Convertible Preferred stock (Details)

Capital Structure -Convertible Preferred stock (Details)			1 Months Ended						3 Months Ended	5 Months Ended	12 Months Ended
	May. 18, 2012 USD ($)	Mar. 23, 2012 USD ($) $ / shares shares	Oct. 31, 2015 USD ($) shares	Aug. 31, 2014 USD ($) $ / shares	Jul. 31, 2014 USD ($) $ / shares shares	Aug. 31, 2013 USD ($) shares	Apr. 30, 2012 USD ($) $ / shares shares	Mar. 31, 2012 USD ($) shares	Jun. 30, 2014 USD ($) $ / shares shares	Jun. 30, 2012 item	Dec. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2013 USD ($) $ / shares shares	Dec. 31, 2015 shares	Oct. 20, 2015 shares	Jan. 31, 2014 $ / shares
Class of Stock [Line Items]
Debt converted								$ 100,000
Carrying value											$ 28,345,531
Investor rights obligation fair value											$ 1,112,000
Convertible promissory notes
Class of Stock [Line Items]
Debt converted		$ 3,000,000
Interest converted		$ 58,000
Common Stock [Member]
Class of Stock [Line Items]
Issuance of stock (in shares) \| shares											6,877
Number of shares available under warrant \| shares						80,966	225,869						7,400,934	22,328
Exercise price per share (in dollars per share) \| $ / shares		$ 28.00					$ 28.00
Warrants issued upon conversion \| shares		36,406						1,190
Fair value of common stock											$ 37,041
Common Stock [Member] \| Placement Agent
Class of Stock [Line Items]
Number of shares available under warrant \| shares													126,091
Series A Convertible preferred stock
Class of Stock [Line Items]
Number of private placement closings \| item										3
Issuance of stock (in shares) \| shares							25,305,583
Share issued upon conversion \| shares		4,077,475						133,333
Issuance of convertible preferred stock								$ 17,700,000
Conversion price \| $ / shares											$ 0.60	$ 0.75
Fair value per share \| $ / shares											$ 0.34
Gain on extinguishment of temporary equity											$ 9,393,746
Carrying value											10,462,885	$ 19,856,632
Fair Value of preferred stock											$ 10,462,886
Series A-1 Convertible preferred stock
Class of Stock [Line Items]
Issuance of stock (in shares) \| shares												9,074,511
Issuance of convertible preferred stock												$ 6,567,064
Conversion price \| $ / shares												$ 0.75			$ 0.50
Fair value per share \| $ / shares											$ 0.37
Gain on extinguishment of temporary equity											$ 3,140,692
Carrying value											3,389,331	$ 1
Fair Value of preferred stock											$ 3,389,330
Preferred stock dividend rate (as a percent)											2.50%
Unamortized beneficial conversion of preferred stock											$ 6,567,063
Series B convertible preferred stock
Class of Stock [Line Items]
Gross proceeds from issuance of preferred stock				$ 1,000,000	$ 14,000,000
Issuance of stock (in shares) \| shares											50,017,786
Share Price \| $ / shares				$ 0.2999	$ 0.2999
Share issued upon conversion \| shares					3,333,331
Additional gross proceeds					$ 1,000,000
Issuance of convertible preferred stock				$ 3,334,445	46,684,455
Conversion price \| $ / shares									$ 0.2249
Carrying value											$ 14,493,315
Aggregate principle balance of the debt					1,000,000
Investor rights obligation fair value					$ 2,600,000
Gain on change in fair value of investor rights obligation			$ 1,100,000
Series B convertible preferred stock \| Convertible promissory notes
Class of Stock [Line Items]
Debt converted									$ 1,300,000
Share issued upon conversion \| shares									5,597,618
IPO \| Common Stock [Member]
Class of Stock [Line Items]
Shares of common stock resulting from conversion of preferred stock (in shares) \| shares			3,980,422
IPO \| Series A Convertible preferred stock
Class of Stock [Line Items]
Number of shares of common stock received for each converted share \| shares			0.04464
IPO \| Series A-1 Convertible preferred stock
Class of Stock [Line Items]
Number of shares of common stock received for each converted share \| shares			0.05357
IPO \| Series B convertible preferred stock
Class of Stock [Line Items]
Number of shares of common stock received for each converted share \| shares			0.03571
Private Placement \| Series A Convertible preferred stock
Class of Stock [Line Items]
Gross proceeds from issuance of preferred stock	$ 1,200,000						$ 19,000,000
Private Placement \| Series A-1 Convertible preferred stock
Class of Stock [Line Items]
Gross proceeds from issuance of preferred stock						$ 6,800,000
Issuance of stock (in shares) \| shares						9,074,511
Issuance of convertible preferred stock						$ 6,100,000