Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation (Details 2)

v3.2.0.727
Stock-based Compensation (Details 2)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
shares
Jun. 30, 2014
USD ($)
shares
Jun. 30, 2015
USD ($)
item
$ / shares
shares
Jun. 30, 2014
USD ($)
$ / shares
shares
Stock Based Compensation        
Share-based compensation | $ $ 1,909 $ 2,132 $ 3,963 $ 4,496
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% 2.10%
Expected term (in years) 7 years 6 years 8 months 12 days 6 years 6 months 6 years 6 months
Dividend yield (as a percent) 0.00% 0.00% 0.00% 0.00%
Expected volatility (as a percent) 66.90% 76.90% 65.10% 75.30%
Additional disclosures        
Options granted (in shares)     3,793,420 3,397,275
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 $ 2.35
Total unrecognized compensation cost, net of estimated forfeitures | $ $ 7,300   $ 7,300  
Shares of common stock available for future grant 4,272,986   4,272,986  
Options exercised during the period (in shares)     155,299  
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