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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Accumulated Deficit
--- | --- | --- | --- | ---
Balance at Dec. 31, 2016 | $ 15,328 |  | $ 229,348 | $ (214,020)
Balance, shares at Dec. 31, 2016 |  | 332 |  |
Issuance of common stock under stock plans, net | (20) |  | (20) |
Issuance of common stock under stock plans, net, shares |  | 6 |  |
Issuance of common stock, net of issuance costs | 1,987 |  | 1,987 |
Issuance of common stock, net of issuance costs, shares |  | 66 |  |
Stock-based compensation | 719 |  | 719 |
Net loss | (10,668) |  |  | (10,668)
Balance at Dec. 31, 2017 | 7,346 |  | 232,034 | (224,688)
Balance, shares at Dec. 31, 2017 |  | 404 |  |
Cumulative effect of accounting change | 230 |  |  | 230
Issuance of common stock under stock plans, net | (46) |  | (46) |
Issuance of common stock under stock plans, net, shares |  | 14 |  |
Issuance of common stock and warrants, net of issuance costs | 10,362 | $ 2 | 10,360 |
Issuance of common stock and warrants, net of issuance costs (in shares) |  | 1,730 |  |
Stock-based compensation | 674 |  | 674 |
Net loss | (11,409) |  |  | (11,409)
Balance at Dec. 31, 2018 | $ 7,157 | $ 2 | 243,022 | (235,867)
Balance, shares at Dec. 31, 2018 | 2,148 | 2,148 |  |
Issuance of common stock under stock plans, net | $ (4) |  | (4) |
Issuance of common stock under stock plans, net, shares |  | 31 |  |
Stock-based compensation | 263 |  | 263 |
Net loss | (2,580) |  |  | (2,580)
Balance at Dec. 31, 2019 | $ 4,836 | $ 2 | $ 243,281 | $ (238,447)
Balance, shares at Dec. 31, 2019 | 2,179 | 2,179 |  |

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