Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation (Details 2)

v3.3.0.814
Stock-based Compensation (Details 2)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
shares
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
item
$ / shares
shares
Sep. 30, 2014
USD ($)
$ / shares
shares
Stock Based Compensation        
Share-based compensation | $ $ 1,815 $ 2,080 $ 5,778 $ 6,576
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% 2.20% 1.80% 2.20%
Expected term (in years) 6 years 6 years 6 years 6 months 6 years 7 months 6 days
Dividend yield (as a percent) 0.00% 0.00% 0.00% 0.00%
Expected volatility (as a percent) 59.60% 67.10% 65.00% 74.90%
Additional disclosures        
Options granted (in shares)     3,811,920 3,424,510
Options outstanding at the end of the period (in shares) 700,000   700,000  
Grant-date weighted-average fair value (in dollars per share) | $ / shares     $ 1.40 $ 2.34
Total unrecognized compensation cost, net of estimated forfeitures | $ $ 5,700   $ 5,700  
Shares of common stock available for future grant 4,660,635   4,660,635  
Options exercised during the period (in shares)     195,364  
Employee Stock Option | Consultant        
Stock Based Compensation        
Contractual term of the option     10 years  
Employee Stock Option | Recipient Of Performance Shares        
Additional disclosures        
Options granted (in shares)     1,175,000 950,000