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Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Accumulated Deficit [Member] | Total
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2018 | $ 150 | $ 1,096,053 | $ (36) | $ (982,106) | $ 114,061
Balance, shares at Dec. 31, 2018 | 150,244 |  |  |  |
Net lincome (loss) |  |  |  | (30,324) | (30,324)
Other comprehensive income |  |  | 42 |  | 42
Issuance of common stock in conjunction with equity plans | $ 3 | 6,687 |  |  | 6,690
Issuance of common stock in conjunction with equity plans, shares | 2,428 |  |  |  |
Stock-based compensation expense |  | 4,381 |  |  | 4,381
Balance at Mar. 31, 2019 | $ 153 | 1,107,121 | 6 | (1,012,430) | 94,850
Balance, shares at Mar. 31, 2019 | 152,672 |  |  |  |
Balance at Dec. 31, 2019 | $ 153 | 1,120,999 | 5 | (1,066,240) | $ 54,917
Balance, shares at Dec. 31, 2019 | 153,119 |  |  |  | 153,119
Net lincome (loss) |  |  |  | 1,262 | $ 1,262
Other comprehensive income |  |  | 25 |  | 25
Adoption effect of Topic 326 |  |  |  | (32) | (32)
Issuance of common stock in conjunction with equity plans | $ 1 | 198 |  |  | 199
Issuance of common stock in conjunction with equity plans, shares | 834 |  |  |  |
Stock-based compensation expense |  | 4,032 |  |  | 4,032
Balance at Mar. 31, 2020 | $ 154 | $ 1,125,229 | $ 30 | $ (1,065,010) | $ 60,403
Balance, shares at Mar. 31, 2020 | 153,953 |  |  |  | 153,953

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