Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - Options (Details)

v3.5.0.2
Stock-based Compensation - Options (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
shares
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
item
$ / shares
shares
Sep. 30, 2015
USD ($)
$ / shares
shares
Stock Based Compensation        
Share-based compensation | $ $ 1,714,000 $ 1,815,000 $ 5,166,000 $ 5,778,000
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)   1.90% 1.70% 1.80%
Expected term (in years)   6 years 6 years 4 months 24 days 6 years 6 months
Dividend yield (as a percent)   0.00% 0.00% 0.00%
Expected volatility (as a percent)   59.60% 63.30% 65.00%
Additional disclosures        
Options granted (in shares) | shares 0   3,833,435 3,811,920
Grant-date weighted-average fair value (in dollars per share) | $ / shares     $ 1.59 $ 1.40
Total unrecognized compensation cost, net of estimated forfeitures | $ $ 5,000,000   $ 5,000,000  
Shares of common stock available for future grant | shares 5,460,280   5,460,280  
Options exercised during the period (in shares) | shares     145,493  
Employee stock option | Consultant        
Stock Based Compensation        
Contractual term of the option     10 years  
Employee stock option | Recipient of performance shares        
Stock Based Compensation        
Share-based compensation | $ $ 0   $ 0  
Additional disclosures        
Options granted (in shares) | shares       1,175,000
Total unrecognized compensation cost, net of estimated forfeitures | $ $ 1,600,000   $ 1,600,000  
Employee stock option | Recipient of performance shares | 2014        
Additional disclosures        
Options outstanding | shares 200,000   200,000  
Grant date fair value of performance stock options awards | $ $ 520,000   $ 520,000  
Employee stock option | Recipient of performance shares | 2016        
Additional disclosures        
Options granted (in shares) | shares     700,000  
Grant date fair value of performance stock options awards | $ $ 1,100,000   $ 1,100,000