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Condensed Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Treasury Stock | Accumulated Other Comprehensive Income (Loss) | Accumulated Deficit
--- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2018 | $ 45,147 | $ 1 | $ 93,583 | $ (3,432) | $ (11) | $ (44,994)
Stock-based compensation |  |  | 514 |  |  |
Issuance of shares for stock purchase plans |  |  | 231 |  |  |
Repurchases of common stock |  |  |  | (193) |  |
Unrealized gain (loss) on available-for-sale securities, net of deferred taxes | 10 |  |  |  | 10 |
Net income (loss) | 337 |  |  |  |  | 337
Ending balance at Mar. 31, 2019 | 46,046 | 1 | 94,328 | (3,625) | (1) | (44,657)
Beginning balance at Dec. 31, 2019 | 47,904 | 1 | 96,622 | (4,659) | 8 | (44,068)
Stock-based compensation |  |  | 668 |  |  |
Issuance of shares for stock purchase plans |  |  | 70 |  |  |
Repurchases of common stock |  |  |  | (190) |  |
Unrealized gain (loss) on available-for-sale securities, net of deferred taxes | (15) |  |  |  | (15) |
Net income (loss) | (1,202) |  |  |  |  | (1,202)
Ending balance at Mar. 31, 2020 | $ 47,235 | $ 1 | $ 97,360 | $ (4,849) | $ (7) | $ (45,270)

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