Annual report pursuant to Section 13 and 15(d)

Common Stock, Stock-Based Awards and Warrants - Restricted Stock (Details)

v3.8.0.1
Common Stock, Stock-Based Awards and Warrants - Restricted Stock (Details) - Restricted stock units - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 2,100 $ 600 $ 100
Units [Abstract]      
Beginning Balance (in shares) 408    
Granted (in shares) 1,618    
Vested (in shares) (264)    
Forfeited (in shares) (124)    
Ending Balance (in shares) 1,638 408  
Vested and expected to vest (in shares) 1,068    
Weighted Average Exercise Price (in dollars per share):      
Beginning Balance (in dollars per share) $ 12.71    
Granted (in dollars per share) 7.91    
Vested (in dollars per share) 9.62    
Forfeited (in dollars per share) 10.98    
Ending Balance (in dollars per share) 8.60 $ 12.71  
Vested and expected to vest (in dollars per share) $ 8.48    
Aggregate Intrinsic Value      
Balance $ 10,579    
Vested and expected to vest $ 6,899