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Consolidated Statements of Equity (Unaudited) - USD ($) $ in Thousands | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Retained Deficit [Member]
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2019 |  | $ 1,498,996 | $ 842 | $ 987,942 | $ 78 | $ 510,134 | [1]
Balance, Shares at Dec. 31, 2019 |  |  | 84,248,000 |  |  |  |
Net income (loss) |  | (18,712) |  |  |  | (18,712) | [1]
Unrealized holding gain (loss) on investments, net of tax |  | (213) |  |  | (213) |  |
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan |  | 1,832 | $ 1 | 1,831 |  |  |
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares |  |  | 78,000 |  |  |  |
Issuance of restricted stock |  |  | $ 10 | (10) |  |  |
Issuance of restricted stock, shares |  |  | 968,000 |  |  |  |
Forfeitures of restricted stock, shares |  |  | (19,000) |  |  |  |
Stock-based compensation expense |  | 8,035 |  | 8,035 |  |  |
Repurchased common stock |  | (2,542) | $ (1) | (2,541) |  |  |
Repurchased common stock, shares |  |  | (125,000) |  |  |  |
Balance at Mar. 31, 2020 |  | 1,487,396 | $ 852 | 995,257 | (135) | 491,422 | [1]
Balance, Shares at Mar. 31, 2020 |  |  | 85,150,000 |  |  |  |
Balance at Dec. 31, 2019 |  | 1,498,996 | $ 842 | 987,942 | 78 | 510,134 | [1]
Balance, Shares at Dec. 31, 2019 |  |  | 84,248,000 |  |  |  |
Net income (loss) |  | (732,192) |  |  |  |  |
Net loss attributable to noncontrolling interest |  |  |  |  |  |  |
Balance at Sep. 30, 2020 |  | 805,006 | $ 855 | 1,023,974 | 1,990 | (221,813) | [1]
Balance, Shares at Sep. 30, 2020 |  |  | 85,504,000 |  |  |  |
Balance at Mar. 31, 2020 |  | 1,487,396 | $ 852 | 995,257 | (135) | 491,422 | [1]
Balance, Shares at Mar. 31, 2020 |  |  | 85,150,000 |  |  |  |
Net income (loss) |  | (672,436) |  |  |  | (672,436) | [1]
Unrealized holding gain (loss) on investments, net of tax |  | 2,078 |  |  | 2,078 |  |
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan |  | 2,544 | $ 3 | 2,541 |  |  |
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares |  |  | 277,000 |  |  |  |
Issuance of restricted stock |  |  | $ 2 | (2) |  |  |
Issuance of restricted stock, shares |  |  | 200,000 |  |  |  |
Forfeitures of restricted stock |  |  | $ (1) | 1 |  |  |
Forfeitures of restricted stock, shares |  |  | (57,000) |  |  |  |
Stock-based compensation expense |  | 7,489 |  | 7,489 |  |  |
Repurchased common stock |  | (501) | $ (1) | (500) |  |  |
Repurchased common stock, shares |  |  | (34,000) |  |  |  |
Balance at Jun. 30, 2020 |  | 826,570 | $ 855 | 1,004,786 | 1,943 | (181,014) | [1]
Balance, Shares at Jun. 30, 2020 |  |  | 85,536,000 |  |  |  |
Net income (loss) |  | (41,044) |  |  |  | (41,044) | [1]
Net loss attributable to noncontrolling interest |  |  |  |  |  |  |
Contribution from noncontrolling interests | [1] | 245 |  |  |  | 245 |
Unrealized holding gain (loss) on investments, net of tax |  | 47 |  |  | 47 |  |
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan |  | 1,324 | $ 1 | 1,323 |  |  |
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares |  |  | 89,000 |  |  |  |
Issuance of restricted stock |  |  | $ 3 | (3) |  |  |
Issuance of restricted stock, shares |  |  | 282,000 |  |  |  |
Forfeitures of restricted stock |  |  | $ (1) | 1 |  |  |
Forfeitures of restricted stock, shares |  |  | (92,000) |  |  |  |
Stock-based compensation expense |  | 23,316 |  | 23,316 |  |  |
Repurchased common stock |  | (5,452) | $ (3) | (5,449) |  |  |
Repurchased common stock, shares |  |  | (311,000) |  |  |  |
Balance at Sep. 30, 2020 |  | 805,006 | $ 855 | 1,023,974 | 1,990 | (221,813) | [1]
Balance, Shares at Sep. 30, 2020 |  |  | 85,504,000 |  |  |  |
Balance at Dec. 31, 2020 |  | 747,717 | $ 856 | 1,029,453 | 3,530 | (286,122) | [1]
Balance, Shares at Dec. 31, 2020 |  |  | 85,593,000 |  |  |  |
Net income (loss) |  | 17,642 |  |  |  | 17,642 | [1]
Net loss attributable to noncontrolling interest | [1] | (8) |  |  |  | (8) |
Unrealized holding gain (loss) on investments, net of tax |  | (1,133) |  |  | (1,133) |  |
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan |  | 1,042 |  | 1,042 |  |  |
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares |  |  | 52,000 |  |  |  |
Issuance of restricted stock |  |  | $ 7 | (7) |  |  |
Issuance of restricted stock, shares |  |  | 660,000 |  |  |  |
Forfeitures of restricted stock, shares |  |  | (13,000) |  |  |  |
Stock-based compensation expense |  | 3,717 |  | 3,717 |  |  |
Repurchased common stock |  | (1,994) | $ (1) | (1,993) |  |  |
Repurchased common stock, shares |  |  | (82,000) |  |  |  |
Balance at Mar. 31, 2021 |  | 766,983 | $ 862 | 1,032,212 | 2,397 | (268,488) | [1]
Balance, Shares at Mar. 31, 2021 |  |  | 86,210,000 |  |  |  |
Balance at Dec. 31, 2020 |  | 747,717 | $ 856 | 1,029,453 | 3,530 | (286,122) | [1]
Balance, Shares at Dec. 31, 2020 |  |  | 85,593,000 |  |  |  |
Net income (loss) |  | 83,448 |  |  |  |  |
Net loss attributable to noncontrolling interest |  | $ (21) |  |  |  |  |
Repurchased common stock, shares |  | 0 |  |  |  |  |
Balance at Sep. 30, 2021 |  | $ 845,677 | $ 864 | 1,045,285 | 2,223 | (202,695) | [1]
Balance, Shares at Sep. 30, 2021 |  |  | 86,402,000 |  |  |  |
Balance at Mar. 31, 2021 |  | 766,983 | $ 862 | 1,032,212 | 2,397 | (268,488) | [1]
Balance, Shares at Mar. 31, 2021 |  |  | 86,210,000 |  |  |  |
Net income (loss) |  | 35,011 |  |  |  | 35,011 | [1]
Net loss attributable to noncontrolling interest |  | (6) |  |  |  | (6) | [1]
Unrealized holding gain (loss) on investments, net of tax |  | 116 |  |  | 116 |  |
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan |  | 1,536 | $ 1 | 1,535 |  |  |
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares |  |  | 71,000 |  |  |  |
Issuance of restricted stock |  |  | $ 1 | (1) |  |  |
Issuance of restricted stock, shares |  |  | 69,000 |  |  |  |
Forfeitures of restricted stock |  |  | $ (1) | 1 |  |  |
Forfeitures of restricted stock, shares |  |  | (5,000) |  |  |  |
Stock-based compensation expense |  | 5,735 |  | 5,735 |  |  |
Repurchased common stock |  | (251) |  | (251) |  |  |
Repurchased common stock, shares |  |  | (8,000) |  |  |  |
Balance at Jun. 30, 2021 |  | 809,124 | $ 863 | 1,039,231 | 2,513 | (233,483) | [1]
Balance, Shares at Jun. 30, 2021 |  |  | 86,337,000 |  |  |  |
Net income (loss) |  | 30,795 |  |  |  | 30,795 | [1]
Net loss attributable to noncontrolling interest |  | (7) |  |  |  | (7) | [1]
Unrealized holding gain (loss) on investments, net of tax |  | 290 |  |  | 290 |  |
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan |  | 3,034 | $ 2 | 3,032 |  |  |
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares |  |  | 148,000 |  |  |  |
Stock-based compensation expense |  | 5,495 |  | 5,495 |  |  |
Repurchased common stock |  | (2,474) | $ (1) | (2,473) |  |  |
Repurchased common stock, shares |  |  | (83,000) |  |  |  |
Balance at Sep. 30, 2021 |  | $ 845,677 | $ 864 | $ 1,045,285 | $ 2,223 | $ (202,695) | [1]
Balance, Shares at Sep. 30, 2021 |  |  | 86,402,000 |  |  |  |
[1] | Presented within retained earnings on the consolidated balance sheet as the balance is immaterial.

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