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Consolidated Statement of Stockholders’ Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive (Loss) Income
Accumulated Deficit
Stockholders' Equity, Beginning Balance (in shares) at Dec. 31, 2019   27,255,000      
Stockholders' Equity, Beginning Balance at Dec. 31, 2019 $ 405,008 $ 27 $ 648,669 $ 338 $ (244,026)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Shares issued under employee stock plans (in shares)   22,000      
Shares issued under employee stock plans 36   36    
Stock-based compensation 2,975   2,975    
Comprehensive income (loss), net 807     807  
Net loss (8,262)       (8,262)
Stockholders' Equity, Ending Balance (in shares) at Mar. 31, 2020   27,277,000      
Stockholders' Equity, Ending Balance at Mar. 31, 2020 400,564 $ 27 651,680 1,145 (252,288)
Stockholders' Equity, Beginning Balance (in shares) at Dec. 31, 2019   27,255,000      
Stockholders' Equity, Beginning Balance at Dec. 31, 2019 405,008 $ 27 648,669 338 (244,026)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net loss (29,810)        
Stockholders' Equity, Ending Balance (in shares) at Jun. 30, 2020   27,287,000      
Stockholders' Equity, Ending Balance at Jun. 30, 2020 381,436 $ 27 654,492 753 (273,836)
Stockholders' Equity, Beginning Balance (in shares) at Mar. 31, 2020   27,277,000      
Stockholders' Equity, Beginning Balance at Mar. 31, 2020 400,564 $ 27 651,680 1,145 (252,288)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Shares issued under employee stock plans (in shares)   10,000      
Shares issued under employee stock plans 71   71    
Stock-based compensation 2,741   2,741    
Comprehensive income (loss), net (392)     (392)  
Net loss (21,548)       (21,548)
Stockholders' Equity, Ending Balance (in shares) at Jun. 30, 2020   27,287,000      
Stockholders' Equity, Ending Balance at Jun. 30, 2020 381,436 $ 27 654,492 753 (273,836)
Stockholders' Equity, Beginning Balance (in shares) at Dec. 31, 2020   27,356,000      
Stockholders' Equity, Beginning Balance at Dec. 31, 2020 396,731 $ 27 660,665 (4) (263,957)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Shares issued under employee stock plans (in shares)   11,000      
Shares issued under employee stock plans 167   167    
Stock-based compensation 3,315   3,315    
Comprehensive income (loss), net (107)     (107)  
Net loss (18,163)       (18,163)
Stockholders' Equity, Ending Balance (in shares) at Mar. 31, 2021   27,367,000      
Stockholders' Equity, Ending Balance at Mar. 31, 2021 381,943 $ 27 664,147 (111) (282,120)
Stockholders' Equity, Beginning Balance (in shares) at Dec. 31, 2020   27,356,000      
Stockholders' Equity, Beginning Balance at Dec. 31, 2020 $ 396,731 $ 27 660,665 (4) (263,957)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Shares issued under employee stock plans (in shares) 77,034        
Net loss $ (18,592)        
Stockholders' Equity, Ending Balance (in shares) at Jun. 30, 2021   27,433,000      
Stockholders' Equity, Ending Balance at Jun. 30, 2021 385,731 $ 27 668,429 (176) (282,549)
Stockholders' Equity, Beginning Balance (in shares) at Mar. 31, 2021   27,367,000      
Stockholders' Equity, Beginning Balance at Mar. 31, 2021 381,943 $ 27 664,147 (111) (282,120)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Shares issued under employee stock plans (in shares)   66,000      
Shares issued under employee stock plans 592   592    
Stock-based compensation 3,690   3,690    
Comprehensive income (loss), net (65)     (65)  
Net loss (429)       (429)
Stockholders' Equity, Ending Balance (in shares) at Jun. 30, 2021   27,433,000      
Stockholders' Equity, Ending Balance at Jun. 30, 2021 $ 385,731 $ 27 $ 668,429 $ (176) $ (282,549)