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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

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