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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, 2017 | $ 46,225 | $ 1 | $ 89,908 | $ (1,257) | $ (17) | $ (42,410)
Stock-based compensation |  |  | 2,536 |  |  |
Issuance of shares for stock purchase plans |  |  | 616 |  |  |
Repurchases of common stock |  |  |  | (1,837) |  |
Unrealized gain on available-for-sale securities, net of deferred taxes | 10 |  |  |  | 10 |
Net income (loss) | (3,858) |  |  |  |  | (3,858)
Ending balance at Sep. 30, 2018 | 43,692 | 1 | 93,060 | (3,094) | (7) | (46,268)
Beginning balance at Jun. 30, 2018 | 43,041 | 1 | 92,336 | (2,580) | (10) | (46,706)
Stock-based compensation |  |  | 408 |  |  |
Issuance of shares for stock purchase plans |  |  | 316 |  |  |
Repurchases of common stock |  |  |  | (514) |  |
Unrealized gain on available-for-sale securities, net of deferred taxes | 3 |  |  |  | 3 |
Net income (loss) | 437 |  |  |  |  | 438
Ending balance at Sep. 30, 2018 | 43,692 | 1 | 93,060 | (3,094) | (7) | (46,268)
Beginning balance at Dec. 31, 2018 | 45,147 | 1 | 93,583 | (3,432) | (11) | (44,994)
Stock-based compensation |  |  | 1,605 |  |  |
Issuance of shares for stock purchase plans |  |  | 779 |  |  |
Repurchases of common stock |  |  |  | (799) |  |
Unrealized gain on available-for-sale securities, net of deferred taxes | 24 |  |  |  | 24 |
Net income (loss) | 863 |  |  |  |  | 863
Ending balance at Sep. 30, 2019 | 47,619 | 1 | 95,967 | (4,231) | 13 | (44,131)
Beginning balance at Jun. 30, 2019 | 47,620 | 1 | 95,228 | (3,625) | 12 | (43,996)
Stock-based compensation |  |  | 549 |  |  |
Issuance of shares for stock purchase plans |  |  | 190 |  |  |
Repurchases of common stock |  |  |  | (606) |  |
Unrealized gain on available-for-sale securities, net of deferred taxes | 1 |  |  |  | 1 |
Net income (loss) | (135) |  |  |  |  | (135)
Ending balance at Sep. 30, 2019 | $ 47,619 | $ 1 | $ 95,967 | $ (4,231) | $ 13 | $ (44,131)

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