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Consolidated Statements of Stockholders' Equity/Deficit-Unaudited - USD ($) shares in Thousands | Total | Common Stock | Additional Paid-In Capital | Accumulated Deficit | Accumulated Other Comprehensive Gain (Loss) | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Balance, shares at Dec. 31, 2021 |  | 150,082 |  |  |  |
Balance, value at Dec. 31, 2021 | $ 113,595,000 | $ 150,000 | $ 1,608,749,000 | $ (1,487,776,000) | $ (10,000) | $ (7,518,000)
Stock-based compensation | 2,772,000 | $ 0 | 2,772,000 | 0 | 0 | 0
Issuance of common stock under Equity Incentive Plans, shares |  | 0 |  |  |  |
Issuance of common stock under Equity Incentive Plans, value | (864,000) | $ 0 | 0 | 0 | 0 | 864,000
Net loss | (23,476,000) | 0 | 0 | (23,476,000) | 0 | 0
Unrealized gain on investments | (27,000) | $ 0 | 0 | 0 | (27,000) | 0
Balance, shares at Mar. 31, 2022 |  | 150,082 |  |  |  |
Balance, value at Mar. 31, 2022 | 92,698,000 | $ 150,000 | 1,605,898,000 | (1,511,252,000) | (37,000) | (2,061,000)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures |  | 0 |  |  |  |
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture | 698,000 | $ 0 | 698,000 | 0 | 0 | 0
Stock Issued During Period, Value, Treasury Stock Reissued | $ 0 | $ 0 | (6,321,000) | 0 | 0 | (6,321,000)
Stock Issued During Period, Shares, Treasury Stock Reissued |  | 0 |  |  |  |
Balance, shares at Dec. 31, 2022 | 189,214 | 189,214 |  |  |  |
Balance, value at Dec. 31, 2022 | $ 117,124,000 | $ 189,000 | 1,709,144,000 | (1,589,720,000) | (428,000) | (2,061,000)
Stock-based compensation | 3,415,000 | 0 | 3,415,000 | 0 | 0 | 0
Repurchase of common stock | (824,000) | 0 | 0 | 0 | 0 | (824,000)
Net loss | (31,934,000) | 0 | 0 | (31,934,000) | 0 | 0
Unrealized gain on investments | $ 265,000 | $ 0 | 0 | 0 | 265,000 | 0
Balance, shares at Mar. 31, 2023 | 190,430 | 190,430 |  |  |  |
Balance, value at Mar. 31, 2023 | $ 88,046,000 | $ 190,000 | 1,712,558,000 | (1,621,654,000) | (163,000) | (2,885,000)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures |  | 1,216 |  |  |  |
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture | 0 | $ 1,000 | $ (1,000) | $ 0 | $ 0 | $ 0
Stock Issued During Period, Value, Treasury Stock Reissued | $ 0 |  |  |  |  |

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