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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) | Total | Adjustment | Common Stock | Additional paid in capital | Accumulated other comprehensive loss | Retained earnings (Accumulated deficit) | Retained earnings (Accumulated deficit) Adjustment
--- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of period (shares) at Dec. 31, 2019 |  |  | 16,823,000 |  |  |  |
Balance at beginning of period at Dec. 31, 2019 | $ 767,232,000 | $ (5,167,000) | $ 17,000 | $ 367,326,000 | $ (216,000) | $ 400,105,000 | $ (5,167,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of common stock under employee stock compensation plans, net (shares) |  |  | 105,000 |  |  |  |
Issuance of common stock under employee stock compensation plans, net | (1,008,000) |  |  | (1,008,000) |  |  |
Share-based compensation | 5,653,000 |  |  | 5,653,000 |  |  |
Repurchase of common stock (shares) |  |  | (878,000) |  |  |  |
Repurchase of common stock | (73,287,000) |  | $ (1,000) | (73,286,000) |  |  |
Unrealized net gain (loss) on available-for-sale securities, net of deferred tax | (2,772,000) |  |  |  | (2,772,000) |  |
Foreign currency translation adjustment | (1,879,000) |  |  |  | (1,879,000) |  |
Reacquisition of equity due to 2023 debt extinguishment, net of tax | (2,745,000) |  |  | (2,745,000) |  |  |
Net income (loss) | (24,131,000) |  |  |  |  | (24,131,000) |
Balance at end of period (shares) at Mar. 31, 2020 |  |  | 16,050,000 |  |  |  |
Balance at end of period at Mar. 31, 2020 | 661,896,000 |  | $ 16,000 | 295,940,000 | (4,867,000) | 370,807,000 |
Balance at beginning of period (shares) at Dec. 31, 2019 |  |  | 16,823,000 |  |  |  |
Balance at beginning of period at Dec. 31, 2019 | 767,232,000 | $ (5,167,000) | $ 17,000 | 367,326,000 | (216,000) | 400,105,000 | $ (5,167,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income (loss) | (2,045,000) |  |  |  |  |  |
Balance at end of period (shares) at Jun. 30, 2020 |  |  | 16,071,000 |  |  |  |
Balance at end of period at Jun. 30, 2020 | 695,003,000 |  | $ 16,000 | 304,404,000 | (2,310,000) | 392,893,000 |
Balance at beginning of period (shares) at Mar. 31, 2020 |  |  | 16,050,000 |  |  |  |
Balance at beginning of period at Mar. 31, 2020 | 661,896,000 |  | $ 16,000 | 295,940,000 | (4,867,000) | 370,807,000 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of common stock under employee stock compensation plans, net (shares) |  |  | 21,000 |  |  |  |
Issuance of common stock under employee stock compensation plans, net | 1,128,000 |  |  | 1,128,000 |  |  |
Share-based compensation | 7,359,000 |  |  | 7,359,000 |  |  |
Unrealized net gain (loss) on available-for-sale securities, net of deferred tax | 2,742,000 |  |  |  | 2,742,000 |  |
Foreign currency translation adjustment | (185,000) |  |  |  | (185,000) |  |
Adjustment on reacquisition of equity due to 2023 debt extinguishment, net of tax | (23,000) |  |  | (23,000) |  |  |
Net income (loss) | 22,086,000 |  |  |  |  | 22,086,000 |
Balance at end of period (shares) at Jun. 30, 2020 |  |  | 16,071,000 |  |  |  |
Balance at end of period at Jun. 30, 2020 | 695,003,000 |  | $ 16,000 | 304,404,000 | (2,310,000) | 392,893,000 |
Balance at beginning of period (shares) at Dec. 31, 2020 |  |  | 16,080,000 |  |  |  |
Balance at beginning of period at Dec. 31, 2020 | 709,525,000 |  | $ 16,000 | 318,358,000 | (801,000) | 391,952,000 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of common stock under employee stock compensation plans, net (shares) |  |  | 572,000 |  |  |  |
Issuance of common stock under employee stock compensation plans, net | 20,581,000 |  | $ 1,000 | 20,580,000 |  |  |
Share-based compensation | 8,405,000 |  |  | 8,405,000 |  |  |
Unrealized net gain (loss) on available-for-sale securities, net of deferred tax | (55,000) |  |  |  | (55,000) |  |
Reacquisition of equity due to 2023 debt extinguishment, net of tax | (9,086,000) |  |  | (9,086,000) |  |  |
Warrant and bond hedge unwind transactions | 396,000 |  |  | 396,000 |  |  |
Tax effect for 2023 Notes transactions | (2,032,000) |  |  | (2,032,000) |  |  |
Net income (loss) | 18,106,000 |  |  |  |  | 18,106,000 |
Balance at end of period (shares) at Mar. 31, 2021 |  |  | 16,652,000 |  |  |  |
Balance at end of period at Mar. 31, 2021 | 745,840,000 |  | $ 17,000 | 336,621,000 | (856,000) | 410,058,000 |
Balance at beginning of period (shares) at Dec. 31, 2020 |  |  | 16,080,000 |  |  |  |
Balance at beginning of period at Dec. 31, 2020 | 709,525,000 |  | $ 16,000 | 318,358,000 | (801,000) | 391,952,000 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Repurchase of common stock | 0 |  |  |  |  |  |
Net income (loss) | 48,831,000 |  |  |  |  |  |
Balance at end of period (shares) at Jun. 30, 2021 |  |  | 16,676,000 |  |  |  |
Balance at end of period at Jun. 30, 2021 | 786,517,000 |  | $ 17,000 | 346,578,000 | (861,000) | 440,783,000 |
Balance at beginning of period (shares) at Mar. 31, 2021 |  |  | 16,652,000 |  |  |  |
Balance at beginning of period at Mar. 31, 2021 | 745,840,000 |  | $ 17,000 | 336,621,000 | (856,000) | 410,058,000 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of common stock under employee stock compensation plans, net (shares) |  |  | 24,000 |  |  |  |
Issuance of common stock under employee stock compensation plans, net | 1,103,000 |  |  | 1,103,000 |  |  |
Share-based compensation | 10,216,000 |  |  | 10,216,000 |  |  |
Unrealized net gain (loss) on available-for-sale securities, net of deferred tax | (5,000) |  |  |  | (5,000) |  |
Reacquisition of equity due to 2023 debt extinguishment, net of tax | (1,073,000) |  |  | (1,073,000) |  |  |
Tax effect for 2023 Notes transactions | (289,000) |  |  | (289,000) |  |  |
Net income (loss) | 30,725,000 |  |  |  |  | 30,725,000 |
Balance at end of period (shares) at Jun. 30, 2021 |  |  | 16,676,000 |  |  |  |
Balance at end of period at Jun. 30, 2021 | $ 786,517,000 |  | $ 17,000 | $ 346,578,000 | $ (861,000) | $ 440,783,000 |

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