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Condensed consolidated statements of stockholders' equity (unaudited) - USD ($)
$ in Thousands
Total
Common stock
Additional paid-in capital
Accumulated deficit
Beginning balance at Mar. 31, 2020 $ 242,171 $ 489 $ 753,213 $ (511,531)
Beginning balance (in shares) at Mar. 31, 2020   48,874,742,000    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 1,512     1,512
Stock-based compensation 4,627   4,627  
Exercise of stock options and vesting of restricted stock 398 $ 2 396  
Exercise of stock options and vesting of restricted stock (in shares)   175,561,000    
Ending balance at Jun. 30, 2020 248,708 $ 491 758,236 (510,019)
Ending balance (in shares) at Jun. 30, 2020   49,050,303,000    
Beginning balance at Mar. 31, 2020 242,171 $ 489 753,213 (511,531)
Beginning balance (in shares) at Mar. 31, 2020   48,874,742,000    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 1,959      
Ending balance at Sep. 30, 2020 254,653 $ 494 763,731 (509,572)
Ending balance (in shares) at Sep. 30, 2020   49,314,029,000    
Beginning balance at Jun. 30, 2020 248,708 $ 491 758,236 (510,019)
Beginning balance (in shares) at Jun. 30, 2020   49,050,303,000    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 447     447
Stock-based compensation 5,385   5,385  
Exercise of stock options and vesting of restricted stock 113 $ 3 110  
Exercise of stock options and vesting of restricted stock (in shares)   263,726,000    
Ending balance at Sep. 30, 2020 254,653 $ 494 763,731 (509,572)
Ending balance (in shares) at Sep. 30, 2020   49,314,029,000    
Beginning balance at Mar. 31, 2021 269,646 $ 504 774,441 (505,299)
Beginning balance (in shares) at Mar. 31, 2021   50,400,510,000    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 8,276     8,276
Stock-based compensation 4,190   4,190  
Exercise of stock options and vesting of restricted stock 510 $ 4 506  
Exercise of stock options and vesting of restricted stock (in shares)   358,575,000    
Ending balance at Jun. 30, 2021 282,622 $ 508 779,137 (497,023)
Ending balance (in shares) at Jun. 30, 2021   50,759,085,000    
Beginning balance at Mar. 31, 2021 269,646 $ 504 774,441 (505,299)
Beginning balance (in shares) at Mar. 31, 2021   50,400,510,000    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 14,000      
Ending balance at Sep. 30, 2021 294,093 $ 511 784,881 (491,299)
Ending balance (in shares) at Sep. 30, 2021   51,049,503,000    
Beginning balance at Jun. 30, 2021 282,622 $ 508 779,137 (497,023)
Beginning balance (in shares) at Jun. 30, 2021   50,759,085,000    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 5,724     5,724
Stock-based compensation 5,033   5,033  
Exercise of stock options and vesting of restricted stock 714 $ 3 711  
Exercise of stock options and vesting of restricted stock (in shares)   290,418,000    
Ending balance at Sep. 30, 2021 $ 294,093 $ 511 $ 784,881 $ (491,299)
Ending balance (in shares) at Sep. 30, 2021   51,049,503,000