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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Total
Beginning Balance - Shares at Mar. 31, 2019 22,320,156        
Beginning Balance - Amount at Mar. 31, 2019 $ 22 $ 33,462 $ (37) $ 59,708 $ 93,155
Issuance of common stock under employee stock option plans, shares 812,842        
Issuance of common stock under employee stock option plans, amount $ 1 3,628     3,629
Stock-based compensation expense   1,922     1,922
Comprehensive loss:          
Net loss       (6,513) (6,513)
Net unrealized gain (loss) on available-for-sale investments     54   54
Ending Balance, Shares at Dec. 31, 2019 23,132,998        
Ending Balance, Amount at Dec. 31, 2019 $ 23 39,012 17 53,195 92,247
Beginning Balance - Shares at Sep. 30, 2019 23,052,473        
Beginning Balance - Amount at Sep. 30, 2019 $ 23 37,903 28 57,815 95,769
Issuance of common stock under employee stock option plans, shares 80,525        
Issuance of common stock under employee stock option plans, amount   480     480
Stock-based compensation expense   629     629
Comprehensive loss:          
Net loss       (4,620) (4,620)
Net unrealized gain (loss) on available-for-sale investments     (11)   (11)
Ending Balance, Shares at Dec. 31, 2019 23,132,998        
Ending Balance, Amount at Dec. 31, 2019 $ 23 39,012 17 53,195 92,247
Beginning Balance - Shares at Mar. 31, 2020 23,229,286        
Beginning Balance - Amount at Mar. 31, 2020 $ 23 40,176 71 49,371 89,641
Issuance of common stock under employee stock option plans, shares 566,677        
Issuance of common stock under employee stock option plans, amount $ 1 3,325     3,326
Stock-based compensation expense   2,101     2,101
Comprehensive loss:          
Net loss       (16,523) (16,523)
Net unrealized gain (loss) on available-for-sale investments     (66)   (66)
Ending Balance, Shares at Dec. 31, 2020 23,795,963        
Ending Balance, Amount at Dec. 31, 2020 $ 24 45,602 5 32,848 78,479
Beginning Balance - Shares at Sep. 30, 2020 23,641,426        
Beginning Balance - Amount at Sep. 30, 2020 $ 24 44,092 43 38,064 82,223
Issuance of common stock under employee stock option plans, shares 154,537        
Issuance of common stock under employee stock option plans, amount   817     817
Stock-based compensation expense   693     693
Comprehensive loss:          
Net loss       (5,216) (5,216)
Net unrealized gain (loss) on available-for-sale investments     (38)   (38)
Ending Balance, Shares at Dec. 31, 2020 23,795,963        
Ending Balance, Amount at Dec. 31, 2020 $ 24 $ 45,602 $ 5 $ 32,848 $ 78,479