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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Accumulated Other Comprehensive Income
Balance at period start (in shares) at Dec. 31, 2020   54,003      
Balance at period start at Dec. 31, 2020 $ 246,274 $ 540 $ 726,504 $ (477,028) $ (3,742)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Common stock offering, net of issuance costs (in shares)   5,750      
Common stock offering, net of issuance costs 87,401 $ 58 87,343    
Stock-based compensation (in shares)   461      
Stock-based compensation 1,886 $ 3 1,883    
Purchase of common stock for retirement (in shares)   (76)      
Purchase of common stock for retirement (1,321)   (1,321)    
Exercise of stock options (in shares)   4      
Exercise of stock options 58   58    
Other comprehensive income 3,996       3,996
Net income (loss) (62,227)     (62,227)  
Balance at period end (in shares) at Mar. 31, 2021   60,142      
Balance at period end at Mar. 31, 2021 276,067 $ 601 814,467 (539,255) 254
Balance at period start (in shares) at Dec. 31, 2020   54,003      
Balance at period start at Dec. 31, 2020 246,274 $ 540 726,504 (477,028) (3,742)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Other comprehensive income 3,996        
Net income (loss) (171,185)        
Balance at period end (in shares) at Jun. 30, 2021   60,185      
Balance at period end at Jun. 30, 2021 169,692 $ 602 817,049 (648,213) 254
Balance at period start (in shares) at Mar. 31, 2021   60,142      
Balance at period start at Mar. 31, 2021 276,067 $ 601 814,467 (539,255) 254
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Common stock offering, net of issuance costs (208)   (208)    
Issuance of common stock for employee stock purchase plan (in shares)   42      
Issuance of common stock for employee stock purchase plan 714 $ 1 713    
Stock-based compensation (in shares)   1      
Stock-based compensation 2,079   2,079    
Purchase of common stock for retirement (2)   (2)    
Other comprehensive income 0        
Net income (loss) (108,958)     (108,958)  
Balance at period end (in shares) at Jun. 30, 2021   60,185      
Balance at period end at Jun. 30, 2021 169,692 $ 602 817,049 (648,213) 254
Balance at period start (in shares) at Dec. 31, 2021   60,162      
Balance at period start at Dec. 31, 2021 265,700 $ 602 821,713 (559,117) 2,502
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation (in shares)   412      
Stock-based compensation 3,658 $ 3 3,655    
Purchase of common stock for retirement (in shares)   (462)      
Purchase of common stock for retirement (6,390) $ (4) (1,431) (4,955)  
Net income (loss) (137,051)     (137,051)  
Balance at period end (in shares) at Mar. 31, 2022   60,112      
Balance at period end at Mar. 31, 2022 125,917 $ 601 823,937 (701,123) 2,502
Balance at period start (in shares) at Dec. 31, 2021   60,162      
Balance at period start at Dec. 31, 2021 265,700 $ 602 821,713 (559,117) 2,502
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Other comprehensive income 0        
Net income (loss) 12,074        
Balance at period end (in shares) at Jun. 30, 2022   60,220      
Balance at period end at Jun. 30, 2022 278,729 $ 602 827,623 (551,998) 2,502
Balance at period start (in shares) at Mar. 31, 2022   60,112      
Balance at period start at Mar. 31, 2022 125,917 $ 601 823,937 (701,123) 2,502
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock for employee stock purchase plan (in shares)   41      
Issuance of common stock for employee stock purchase plan 632   632    
Stock-based compensation (in shares)   3      
Stock-based compensation 2,017   2,017    
Purchase of common stock for retirement (in shares)   (1)      
Purchase of common stock for retirement (94)   (94)    
Exercise of stock options (in shares)   65      
Exercise of stock options 1,132 $ 1 1,131    
Other comprehensive income 0        
Net income (loss) 149,125     149,125  
Balance at period end (in shares) at Jun. 30, 2022   60,220      
Balance at period end at Jun. 30, 2022 $ 278,729 $ 602 $ 827,623 $ (551,998) $ 2,502