Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies - Restricted Cash (Details)

v3.7.0.1
Significant Accounting Policies - Restricted Cash (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Deposits $ 50  
Security deposit required, end of third year $ 13  
Employee Stock Purchase Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Deposits made by employees   $ 20