Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - Options (Details)

v3.7.0.1
Stock-based Compensation - Options (Details)
 3 Months Ended
Mar. 31, 2017
USD ($)
item
$ / shares
shares
Dec. 31, 2016
USD ($)
Mar. 31, 2016
USD ($)
$ / shares
shares
Stock Based Compensation      
Share-based compensation | $ $ 955,000   $ 1,438,000
Additional disclosures      
Shares of common stock available for future grant 5,152,425    
Employee stock option      
Stock Based Compensation      
Number of homogenous groups for purposes of determining fair values of options | item 3    
Contractual term of the option 10 years    
Weighted-average assumptions relating to options granted      
Risk-free interest rate (as a percent) 2.30%   1.80%
Expected term (in years) 6 years 9 months 18 days   6 years 7 months 6 days
Dividend yield (as a percent) 0.00%   0.00%
Expected volatility (as a percent) 62.90%   60.50%
Additional disclosures      
Total unrecognized compensation cost, net of estimated forfeitures | $ $ 7,800,000    
Options exercised during the period (in shares) 161,380    
Employee stock option | Granted 2016      
Additional disclosures      
Options granted (in shares)     3,184,250
Grant-date weighted-average fair value (in dollars per share) | $ / shares     $ 1.60
Employee stock option | Granted 2017      
Additional disclosures      
Options granted (in shares) 2,624,175    
Grant-date weighted-average fair value (in dollars per share) | $ / shares $ 1.32    
Employee stock option | Consultant      
Stock Based Compensation      
Contractual term of the option 10 years    
Employee stock option | Recipient of performance shares | Granted 2016      
Additional disclosures      
Options granted (in shares) 200,000    
Employee stock option | Recipient of performance shares | Vesting upon achievement of corporate performance-based milestones      
Stock Based Compensation      
Share-based compensation | $ $ 0 $ 1,100,000 $ 0
Employee stock option | Recipient of performance shares | Vesting upon achievement of corporate performance-based milestones | Granted 2016      
Additional disclosures      
Options granted (in shares) 100,000   700,000
Grant date fair value of performance stock options awards | $ $ 232,000   $ 1,100,000
Employee stock option | Recipient of performance shares | Vesting upon achievement of corporate performance-based milestones | Granted 2017      
Additional disclosures      
Options granted (in shares) 1,025,000    
Grant date fair value of performance stock options awards | $ $ 1,300,000    
Employee stock option | Recipient of performance shares | Vesting upon achievement of certain corporate sales target      
Stock Based Compensation      
Share-based compensation | $ $ 0    
Employee stock option | Recipient of performance shares | Vesting upon achievement of certain corporate sales target | Granted 2016      
Additional disclosures      
Options granted (in shares) 100,000    
Grant date fair value of performance stock options awards | $ $ 240,000    
Employee stock option | Recipient of performance shares | Vesting upon achievement of certain corporate sales target | Granted 2017      
Additional disclosures      
Options granted (in shares) 50,000    
Grant date fair value of performance stock options awards | $ $ 71,000