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Basic and Diluted Net Income (Loss) per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Aug. 17, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Feb. 14, 2014
Components of basic and diluted net income (loss) per share              
Net income (loss)   $ 16,196,000 $ (20,584,000) $ 8,074,000 $ 25,578,000    
Weighted average common shares outstanding   34,171 33,223 34,377 30,379    
Effect of dilutive securities:              
Stock options and RSUs   558 0 387 1,568    
Warrants   0 0 0 3,015    
Convertible 2.5% notes   7,382 0 0 0    
Shares used in calculating dilutive net income (loss) per share   42,111 33,223 34,764 34,962    
Net income (loss) per share:              
Basic (in usd per share)   $ 0.47 $ (0.62) $ 0.23 $ 0.84    
Diluted (in usd per share)   $ 0.43 $ (0.62) $ 0.23 $ 0.73    
Anti-dilutive securities (in shares)   9,849 18,465 18,196 8,330    
Options to purchase shares of common stock              
Net income (loss) per share:              
Anti-dilutive securities (in shares)   2,218 2,989 2,778 791    
Shares of common stock issuable upon the vesting of RSUs              
Net income (loss) per share:              
Anti-dilutive securities (in shares)   249 712 654 157    
Warrants              
Net income (loss) per share:              
Anti-dilutive securities (in shares)   7,382 7,382 7,382 0    
Convertible 2.5% notes              
Net income (loss) per share:              
Anti-dilutive securities (in shares)   0 7,382 7,382 7,382    
Convertible 2.5% notes, net              
Basic and Diluted Net Income (Loss) per Share              
Principal amount of debt at time of issuance   $ 200,000,000.0   $ 200,000,000.0     $ 200,000,000
Interest rate (as a percent)   2.50%   2.50%   2.50%  
Elimination of interest expense   $ 1,900,000          
2015 Term Loan Facility              
Basic and Diluted Net Income (Loss) per Share              
Principal amount of debt at time of issuance $ 350,000,000         $ 350,000,000.0  
Debt term (in years) 6 years         6 years