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 6 Months Ended
Jun. 30, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
item
$ / shares
shares
Jun. 30, 2016
USD ($)
$ / shares
shares
Stock Based Compensation          
Share-based compensation | $ $ 1,100,000   $ 2,014,000 $ 2,055,000 $ 3,452,000
Additional disclosures          
Shares of common stock available for future grant 10,244,931     10,244,931  
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) 2.10%   1.50% 2.20% 1.70%
Expected term (in years) 6 years 7 months 6 days   7 years 6 years 9 months 18 days 6 years 4 months 24 days
Dividend yield (as a percent) 0.00%   0.00% 0.00% 0.00%
Expected volatility (as a percent) 63.70%   76.90% 63.00% 63.30%
Additional disclosures          
Total unrecognized compensation costs | $ $ 7,500,000     $ 7,500,000  
Options exercised during the period (in shares)       166,796  
Employee stock option | Granted 2016          
Additional disclosures          
Options granted (in shares)         3,833,435
Grant-date weighted-average fair value (in dollars per share) | $ / shares         $ 1.59
Employee stock option | Granted 2017          
Additional disclosures          
Options granted (in shares)       2,992,675  
Grant-date weighted-average fair value (in dollars per share) | $ / shares       $ 1.35  
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     $ 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)       75,000  
Grant date fair value of performance stock options awards | $       $ 111,000