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Consolidated statements of stockholders' equity - USD ($)
$ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Common stock
Additional paid-in capital
Accumulated deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Adoption of new accounting standard $ 193,863 $ (54) $ 463 $ 720,372 $ (526,972)
Beginning balance at Dec. 31, 2017 193,863 (54) $ 463 720,372 (526,972)
Beginning balance (in shares) at Dec. 31, 2017     46,315,630    
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) 15,525       15,525
Stock-based compensation 16,821     16,821  
Exercise of stock options and vesting of restricted stock 3,176   $ 15 3,161  
Exercise of stock options and vesting of restricted stock (in shares)     1,514,126    
Adoption of new accounting standard 229,331 $ (54) $ 478 740,354 (511,501)
Ending balance at Dec. 31, 2018 229,331   $ 478 740,354 (511,501)
Ending balance (in shares) at Dec. 31, 2018     47,829,756    
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Adoption of new accounting standard 229,331   $ 478 740,354 (511,501)
Net income (loss) (17,914)       (17,914)
Stock-based compensation 3,683     3,683  
Exercise of stock options and vesting of restricted stock 115   $ 5 110  
Exercise of stock options and vesting of restricted stock (in shares)     458,964    
Adoption of new accounting standard 215,215   $ 483 744,147 (529,415)
Ending balance at Mar. 31, 2019 215,215   $ 483 744,147 (529,415)
Ending balance (in shares) at Mar. 31, 2019     48,288,720    
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Adoption of new accounting standard 215,215   $ 483 744,147 (529,415)
Net income (loss) 17,884       17,884
Stock-based compensation 15,488     15,488  
Exercise of stock options and vesting of restricted stock 1,488   $ 12 1,476  
Exercise of stock options and vesting of restricted stock (in shares)     1,150,490    
Adoption of new accounting standard 242,171   $ 489 753,213 (511,531)
Repurchase of common stock (7,904)   $ (6) (7,898)  
Repurchase of common stock (in shares)     (564,468)    
Ending balance at Mar. 31, 2020 242,171   $ 489 753,213 (511,531)
Ending balance (in shares) at Mar. 31, 2020     48,874,742    
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Adoption of new accounting standard 242,171   $ 489 753,213 (511,531)
Net income (loss) 6,232       6,232
Stock-based compensation 19,493     19,493  
Exercise of stock options and vesting of restricted stock 1,750   $ 15 1,735  
Exercise of stock options and vesting of restricted stock (in shares)     1,525,768    
Adoption of new accounting standard $ 242,171   $ 504 774,441 (505,299)
Repurchase of common stock (in shares) 0        
Ending balance at Mar. 31, 2021 $ 269,646   $ 504 774,441 (505,299)
Ending balance (in shares) at Mar. 31, 2021     50,400,510    
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Adoption of new accounting standard $ 269,646   $ 504 $ 774,441 $ (505,299)