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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, 2018 | 21,407,247 |  |  |  |
Beginning Balance - Amount at Mar. 31, 2018 | $ 21 | $ 27,391 | $ (142) | $ 59,545 | $ 86,815
Issuance of common stock under employee stock option plans, shares | 933,746 |  |  |  |
Issuance of common stock under employee stock option plans, amount | $ 1 | 3,908 |  |  | 3,909
Repurchase and retirement of common stock, shares | (20,837) |  |  |  |
Repurchase and retirement of common stock, amount |  | (103) |  |  | (103)
Stock-based compensation expense |  | 2,266 |  |  | 2,266
Comprehensive income (loss): |  |  |  |  |
Net income (loss) |  |  |  | 163 | 163
Net unrealized gain (loss) on available-for-sale investments |  |  | 105 |  | 105
Ending Balance, Shares at Mar. 31, 2019 | 22,320,156 |  |  |  |
Ending Balance, Amount at Mar. 31, 2019 | $ 22 | 33,462 | (37) | 59,708 | 93,155
Issuance of common stock under employee stock option plans, shares | 909,130 |  |  |  |
Issuance of common stock under employee stock option plans, amount | $ 1 | 4,148 |  |  | 4,149
Stock-based compensation expense |  | 2,566 |  |  | 2,566
Comprehensive income (loss): |  |  |  |  |
Net income (loss) |  |  |  | (10,337) | (10,337)
Net unrealized gain (loss) on available-for-sale investments |  |  | 108 |  | 108
Ending Balance, Shares at Mar. 31, 2020 | 23,229,286 |  |  |  |
Ending Balance, Amount at Mar. 31, 2020 | $ 23 | 40,176 | 71 | 49,371 | 89,641
Issuance of common stock under employee stock option plans, shares | 790,990 |  |  |  |
Issuance of common stock under employee stock option plans, amount | $ 1 | 4,692 |  |  | 4,693
Stock-based compensation expense |  | 2,854 |  |  | 2,854
Comprehensive income (loss): |  |  |  |  |
Net income (loss) |  |  |  | (21,505) | (21,505)
Net unrealized gain (loss) on available-for-sale investments |  |  | (91) |  | (91)
Ending Balance, Shares at Mar. 31, 2021 | 24,020,276 |  |  |  |
Ending Balance, Amount at Mar. 31, 2021 | $ 24 | $ 47,722 | $ (20) | $ 27,866 | $ 75,592

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