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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common stock
Additional paid-in capital
Accumulated other comprehensive loss
Accumulated deficit
Beginning balance (in shares) at Dec. 31, 2019   38,084      
Beginning balance at Dec. 31, 2019 $ 216,608 $ 15 $ 336,732 $ (2,685) $ (117,454)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net loss (7,475)       (7,475)
Issuance of common stock pursuant to exercise of stock options (in shares)   373      
Issuance of common stock pursuant to exercise of stock options 558   558    
Issuance of common stock pursuant to vesting of restricted stock awards and units, net of stock withheld for tax (in shares)   16      
Issuance of common stock pursuant to vesting of restricted stock awards and units, net of stock withheld for tax (11)   (11)    
Stock-based compensation 3,763   3,763    
Cumulative translation adjustment, net of tax (496)     (496)  
Ending balance (in shares) at Mar. 31, 2020   38,473      
Ending balance at Mar. 31, 2020 $ 212,947 $ 15 341,042 (3,181) (124,929)
Beginning balance (in shares) at Dec. 31, 2020 39,793 39,793      
Beginning balance at Dec. 31, 2020 $ 219,914 $ 15 358,544 (259) (138,386)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net loss (6,149)       (6,149)
Proceeds from follow-on offering, net of offering costs (in shares)   2,537      
Proceeds from follow-on offering, net of offering costs $ 82,355   82,355    
Issuance of common stock pursuant to exercise of stock options (in shares) 452 452      
Issuance of common stock pursuant to exercise of stock options $ 574   574    
Issuance of common stock pursuant to vesting of restricted stock awards and units, net of stock withheld for tax (in shares)   1      
Issuance of common stock pursuant to vesting of restricted stock awards and units, net of stock withheld for tax (31)   (31)    
Stock-based compensation 8,054   8,054    
Cumulative translation adjustment, net of tax $ (662)     (662)  
Ending balance (in shares) at Mar. 31, 2021 42,783 42,783      
Ending balance at Mar. 31, 2021 $ 304,055 $ 15 $ 449,496 $ (921) $ (144,535)