v3.4.0.3
Stockholders' Equity - Stock Option Activity (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2016
USD ($)
$ / shares
shares
Class of Stock  
Closing market price of common stock (in USD per share) $ 8.89
Stock Options  
Options Outstanding [Roll Forward]  
Outstanding, beginning balance (in shares) | shares 6,092
Options granted (weighted average grant date fair value of $3.81 per share) (in shares) | shares 644
Options exercised (in shares) | shares (499)
Options forfeited or expired (in shares) | shares (257)
Outstanding, ending balance (in shares) | shares 5,980
Options Outstanding, Weighted Average Exercise Price [Roll Forward]  
Outstanding, beginning balance, weighted average exercise price (in USD per share) $ 4.58
Options granted, weighted average exercise price (in USD per share) 8.13
Options exercised, weighted average exercise price (in USD per share) 4.81
Options forfeited or expired, weighted average exercise price (in USD per share) 6.80
Outstanding, ending balance, weighted average exercise price (in USD per share) 4.85
Weighted average grant date fair value, options granted (in USD per share) $ 3.81
Outstanding, ending balance, weighted average remaining contractual life 6 years 6 months 19 days
Outstanding, ending balance, aggregate intrinsic value | $ $ 26,039