Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation (Details 3)

v3.3.0.814
Stock-based Compensation (Details 3) - Employee Stock
9 Months Ended
Sep. 30, 2015
USD ($)
item
shares
Sep. 30, 2014
Weighted-average assumptions relating to options granted    
Risk-free interest rate (as a percent) 0.60% 0.30%
Expected term (in years) 1 year 6 months 1 year 8 months 12 days
Dividend yield (as a percent) 0.00% 0.00%
Expected volatility (as a percent) 61.20% 66.00%
Additional disclosures    
Award offering period 24 months  
Number of purchase periods per award offering period 4  
Award purchase period 6 months  
Purchase price expressed as a percentage of fair market value of common stock on the purchase date 85.00%  
Purchase price expressed as a percentage of fair market value of common stock on the first day of the offering period 85.00%  
Total incremental fair value for the Purchase Plan reset | $ $ 792,000  
Shares reserved for future issuance | shares 3,290,397