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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, 2020 |  | $ 747,717 | $ 856 | $ 1,029,453 | $ 3,530 | $ (286,122)
Balance, Shares at Dec. 31, 2020 |  |  | 85,593,000 |  |  |
Net income (loss) |  | 17,642 |  |  |  | 17,642
Net loss attributable to noncontrolling interest | [1] | (8) |  |  |  | (8)
Unrealized holding loss (gain) 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)
Balance, Shares at Mar. 31, 2021 |  |  | 86,210,000 |  |  |
Balance at Dec. 31, 2020 |  | 747,717 | $ 856 | 1,029,453 | 3,530 | (286,122)
Balance, Shares at Dec. 31, 2020 |  |  | 85,593,000 |  |  |
Net income (loss) |  | 83,448 |  |  |  |
Net loss attributable to noncontrolling interest |  | (21) |  |  |  |
Balance at Sep. 30, 2021 |  | 845,677 | $ 864 | 1,045,285 | 2,223 | (202,695)
Balance, Shares at Sep. 30, 2021 |  |  | 86,402,000 |  |  |
Balance at Mar. 31, 2021 |  | 766,983 | $ 862 | 1,032,212 | 2,397 | (268,488)
Balance, Shares at Mar. 31, 2021 |  |  | 86,210,000 |  |  |
Net income (loss) |  | 35,011 |  |  |  | 35,011
Net loss attributable to noncontrolling interest | [1] | (6) |  |  |  | (6)
Unrealized holding loss (gain) 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)
Balance, Shares at Jun. 30, 2021 |  |  | 86,337,000 |  |  |
Net income (loss) |  | 30,795 |  |  |  | 30,795
Net loss attributable to noncontrolling interest | [1] | (7) |  |  |  | (7)
Unrealized holding loss (gain) 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)
Balance, Shares at Sep. 30, 2021 |  |  | 86,402,000 |  |  |
Balance at Dec. 31, 2021 |  | 896,692 | $ 864 | 1,049,696 | 1,317 | (155,185)
Balance, Shares at Dec. 31, 2021 |  |  | 86,423,000 |  |  |
Net income (loss) |  | (21,188) |  |  |  | (21,188)
Dissolution of and net loss attributable to noncontrolling interest | [1] | (203) |  | 10 |  | (213)
Unrealized holding loss (gain) on investments, net of tax |  | (2,668) |  |  | (2,668) |
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan |  | 1,174 |  | 1,174 |  |
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares |  |  | 50,000 |  |  |
Issuance of restricted stock |  |  | $ 8 | (8) |  |
Issuance of restricted stock, shares |  |  | 766,000 |  |  |
Forfeitures of restricted stock, shares |  |  | (5,000) |  |  |
Stock-based compensation expense |  | 4,435 |  | 4,435 |  |
Repurchased common stock |  | (1,166) |  | 1,166 |  |
Repurchased common stock, shares |  |  | 50,000 |  |  |
Balance at Mar. 31, 2022 |  | 877,076 | $ 872 | 1,054,141 | (1,351) | (176,586)
Balance, Shares at Mar. 31, 2022 |  |  | 87,184,000 |  |  |
Balance at Dec. 31, 2021 |  | 896,692 | $ 864 | 1,049,696 | 1,317 | (155,185)
Balance, Shares at Dec. 31, 2021 |  |  | 86,423,000 |  |  |
Net income (loss) |  | 36,676 |  |  |  |
Net loss attributable to noncontrolling interest |  | $ (4) |  |  |  |
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares |  | 0 |  |  |  |
Repurchased common stock, shares |  | 0 |  |  |  |
Balance at Sep. 30, 2022 |  | $ 858,667 | $ 830 | 980,659 | (4,100) | (118,722)
Balance, Shares at Sep. 30, 2022 |  |  | 83,006,000 |  |  |
Balance at Mar. 31, 2022 |  | 877,076 | $ 872 | 1,054,141 | (1,351) | (176,586)
Balance, Shares at Mar. 31, 2022 |  |  | 87,184,000 |  |  |
Net income (loss) |  | 27,136 |  |  |  | 27,136
Unrealized holding loss (gain) on investments, net of tax |  | (1,234) |  |  | (1,234) |
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan |  | 1,664 | $ 1 | 1,663 |  |
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares |  |  | 82,000 |  |  |
Issuance of restricted stock |  |  | $ 1 | (1) |  |
Issuance of restricted stock, shares |  |  | 74,000 |  |  |
Forfeitures of restricted stock, shares |  |  | (5,000) |  |  |
Stock-based compensation expense |  | 5,186 |  | 5,186 |  |
Repurchased common stock |  | (64,398) | $ (33) | (64,365) |  |
Repurchased common stock, shares |  |  | (3,275,000) |  |  |
Balance at Jun. 30, 2022 |  | 845,430 | $ 841 | 996,624 | (2,585) | (149,450)
Balance, Shares at Jun. 30, 2022 |  |  | 84,060,000 |  |  |
Net income (loss) |  | 30,728 |  |  |  | 30,728
Net loss attributable to noncontrolling interest |  | (0) |  |  |  |
Unrealized holding loss (gain) on investments, net of tax |  | (1,515) |  |  | (1,515) |
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan |  | 1,381 | $ 1 | 1,380 |  |
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares |  |  | 74,000 |  |  |
Issuance of restricted stock, shares |  |  | 1,000 |  |  |
Forfeitures of restricted stock |  |  | $ (1) | 1 |  |
Forfeitures of restricted stock, shares |  |  | (8,000) |  |  |
Stock-based compensation expense |  | 4,120 |  | 4,120 |  |
Repurchased common stock |  | (21,477) | $ 11 | 21,466 |  |
Repurchased common stock, shares |  |  | 1,121,000 |  |  |
Balance at Sep. 30, 2022 |  | $ 858,667 | $ 830 | $ 980,659 | $ (4,100) | $ (118,722)
Balance, Shares at Sep. 30, 2022 |  |  | 83,006,000 |  |  |
[1] | Net loss component is presented within retained deficit on the consolidated balance sheet as the balance is immaterial.

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