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Consolidated Statements of Stockholders' Equity/Deficit-Unaudited - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Accumulated Deficit | Accumulated Other Comprehensive Gain (Loss) | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Balance, shares at Dec. 31, 2019 |  | 106,679 |  |  |  |
Balance, value at Dec. 31, 2019 | $ 117,101 | $ 106 | $ 1,462,172 | $ (1,341,444) | $ 84 | $ (3,817)
Stock-based compensation | 4,432 | 0 | 4,432 | 0 | 0 | 0
Repurchase of common stock | (923) | 0 | 0 | 0 | 0 | (923)
Net loss |  | 0 | 0 | (66,611) | 0 | 0
Unrealized gain on investments | 776 | $ 0 | 0 | 0 | 776 | 0
Balance, shares at Mar. 31, 2020 |  | 107,711 |  |  |  |
Balance, value at Mar. 31, 2020 | 54,777 | $ 108 | 1,466,604 | (1,408,055) | 860 | (4,740)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures |  | 1,032 |  |  |  |
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture | 2 | $ 2 | 0 | 0 | 0 | 0
Balance, shares at Dec. 31, 2019 |  | 106,679 |  |  |  |
Balance, value at Dec. 31, 2019 | 117,101 | $ 106 | 1,462,172 | (1,341,444) | 84 | (3,817)
Net loss | (135,682) |  |  |  |  |
Unrealized gain on investments | 228 |  |  |  |  |
Balance, shares at Jun. 30, 2020 |  | 107,898 |  |  |  |
Balance, value at Jun. 30, 2020 | (10,687) | $ 108 | 1,470,862 | (1,477,126) | 312 | (4,843)
Balance, shares at Mar. 31, 2020 |  | 107,711 |  |  |  |
Balance, value at Mar. 31, 2020 | 54,777 | $ 108 | 1,466,604 | (1,408,055) | 860 | (4,740)
Stock-based compensation | 4,258 | $ 0 | 4,258 | 0 | 0 | 0
Issuance of common stock under Equity Incentive Plans, shares |  | 187 |  |  |  |
Issuance of common stock under Equity Incentive Plans, value | 0 | $ 0 | 0 | 0 | 0 | 0
Repurchase of common stock | (103) | 0 | 0 | 0 | 0 | (103)
Net loss | (69,071) | 0 | 0 | (69,071) | 0 | 0
Unrealized gain on investments | (548) | $ 0 | 0 | 0 | (548) | 0
Balance, shares at Jun. 30, 2020 |  | 107,898 |  |  |  |
Balance, value at Jun. 30, 2020 | $ (10,687) | $ 108 | 1,470,862 | (1,477,126) | 312 | (4,843)
Balance, shares at Dec. 31, 2020 | 142,289 | 142,289 |  |  |  |
Balance, value at Dec. 31, 2020 | $ 156,371 | $ 142 | 1,561,096 | (1,400,018) | (6) | (4,843)
Stock-based compensation | 2,851 | $ 0 | 2,851 | 0 | 0 | 0
Issuance of common stock under Equity Incentive Plans, shares |  | 2,000 |  |  |  |
Issuance of common stock under Equity Incentive Plans, value | 16,399 | $ 2 | 16,397 | 0 | 0 | 0
Repurchase of common stock | (2,675) | 0 | 0 | 0 | 0 | (2,675)
Net loss | (20,958) | 0 | 0 | (20,958) | 0 | 0
Unrealized gain on investments | 11 | $ 0 | 0 | 0 | 11 | 0
Balance, shares at Mar. 31, 2021 |  | 145,552 |  |  |  |
Balance, value at Mar. 31, 2021 | 152,547 | $ 145 | 1,580,891 | (1,420,976) | 5 | (7,518)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures |  | 1,263 |  |  |  |
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture | $ 548 | $ 1 | 547 | 0 | 0 | 0
Balance, shares at Dec. 31, 2020 | 142,289 | 142,289 |  |  |  |
Balance, value at Dec. 31, 2020 | $ 156,371 | $ 142 | 1,561,096 | (1,400,018) | (6) | (4,843)
Net loss | (39,025) |  |  |  |  |
Unrealized gain on investments | $ 1 |  |  |  |  |
Balance, shares at Jun. 30, 2021 | 145,640 | 145,640 |  |  |  |
Balance, value at Jun. 30, 2021 | $ 137,233 | $ 146 | 1,583,653 | (1,439,043) | (5) | (7,518)
Balance, shares at Mar. 31, 2021 |  | 145,552 |  |  |  |
Balance, value at Mar. 31, 2021 | 152,547 | $ 145 | 1,580,891 | (1,420,976) | 5 | (7,518)
Stock-based compensation | $ 2,786 | 0 | 2,786 | 0 | 0 | 0
Issuance of common stock under Equity Incentive Plans, shares | 88 |  |  |  |  |
Issuance of common stock under Equity Incentive Plans, value | $ 8 | 1 | 7 | 0 | 0 | 0
Payments of Stock Issuance Costs | 31 | 0 | (31) | 0 | 0 | 0
Net loss | (18,067) | 0 | 0 | (18,067) | 0 | 0
Unrealized gain on investments | $ (10) | $ 0 | 0 | 0 | (10) | 0
Balance, shares at Jun. 30, 2021 | 145,640 | 145,640 |  |  |  |
Balance, value at Jun. 30, 2021 | $ 137,233 | $ 146 | $ 1,583,653 | $ (1,439,043) | $ (5) | $ (7,518)

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