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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2017   44,938,133      
Beginning balance at Dec. 31, 2017 $ 131,387 $ 45 $ 492,802 $ (34) $ (361,426)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net proceeds from public offering of common stock 100,870 $ 6 100,864    
Net proceeds from public offering of common stock (in shares)   6,325,000      
Issuance of common stock from the exercise of stock options and settlement of restricted stock units 6,256 $ 1 6,255    
Issuance of common stock from the exercise of stock options and settlement of restricted stock units (in shares)   1,214,460      
Stock-based compensation expense 11,666   11,666    
Net income 25,208       25,208
Other comprehensive income (loss), net of tax 35     35  
Ending balance (in shares) at Dec. 31, 2018   52,477,593      
Ending balance at Dec. 31, 2018 275,422 $ 52 611,587 1 (336,218)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock from the exercise of stock options and settlement of restricted stock units 6,264 $ 2 6,262    
Issuance of common stock from the exercise of stock options and settlement of restricted stock units (in shares)   1,072,019      
Stock-based compensation expense 13,458   13,458    
Net income 115,553       115,553
Other comprehensive income (loss), net of tax $ 248     248  
Ending balance (in shares) at Dec. 31, 2019 53,549,612 53,549,612      
Ending balance at Dec. 31, 2019 $ 410,945 $ 54 631,307 249 (220,665)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock from the exercise of stock options and settlement of restricted stock units 5,634 $ 1 5,633    
Issuance of common stock from the exercise of stock options and settlement of restricted stock units (in shares)   1,315,480      
Stock-based compensation expense 13,360   13,360    
Net income 23,337       23,337
Other comprehensive income (loss), net of tax $ (10)     (10)  
Ending balance (in shares) at Dec. 31, 2020 54,865,092 54,865,092      
Ending balance at Dec. 31, 2020 $ 453,266 $ 55 $ 650,300 $ 239 $ (197,328)