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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] Revision of Prior Period, Accounting Standards Update, Adjustment [Member] | Accumulated Deficit [Member] | Revision of Prior Period, Accounting Standards Update, Adjustment [Member] | Total
--- | --- | --- | --- | --- | --- | --- | ---
Balance (Accounting Standards Update, Topic 326 [Member]) at Dec. 31, 2019 |  |  |  | $ (32) |  | $ (32) |
Balance at Dec. 31, 2019 | $ 153 | $ 1,120,999 | $ 5 |  | $ (1,066,240) |  | $ 54,917
Balance, shares at Dec. 31, 2019 | 153,119 |  |  |  |  |  |
Net income (loss) |  |  |  |  | 1,262 |  | 1,262
Other comprehensive income (loss) |  |  | 25 |  |  |  | 25
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 |  |  |  |  |  |
Balance at Dec. 31, 2020 | $ 192 | 1,372,083 | 85 |  | (1,036,869) |  | $ 335,491
Balance, shares at Dec. 31, 2020 | 192,294 |  |  |  |  |  | 192,294
Net income (loss) |  |  |  |  | (87,435) |  | $ (87,435)
Other comprehensive income (loss) |  |  | (11) |  |  |  | (11)
Issuance of common stock in conjunction with equity plans | $ 6 | 22,337 |  |  |  |  | 22,343
Issuance of common stock in conjunction with equity plans, shares | 6,046 |  |  |  |  |  |
Stock-based compensation expense |  | 10,165 |  |  |  |  | 10,165
Balance at Mar. 31, 2021 | $ 198 | $ 1,404,585 | $ 74 |  | $ (1,124,304) |  | $ 280,553
Balance, shares at Mar. 31, 2021 | 198,340 |  |  |  |  |  | 198,340

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