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Unaudited Condensed Consolidated Statements of Stockholder's Equity - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Accumulated Other Comprehensive Income (Loss) | Accumulated Deficit
--- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2018 | $ 627,552 | $ 32 | $ 793,585 | $ (15) | $ (166,050)
Beginning balance (in shares) at Dec. 31, 2018 |  | 31,562,000 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Change in unrealized gains and losses on available-for-sale investments, net of tax | 12 |  |  | 12 |
Change in unrealized gains and losses on derivatives, net of tax | 17 |  |  | 17 |
Net income (loss) | 12,843 |  |  |  | 12,843
Stock-based compensation | 6,457 |  | 6,457 |  |
Repurchase of common stock | (15,000) |  |  |  | (15,000)
Repurchase of common stock (in shares) |  | (436,000) |  |  |
Restricted stock unit withholdings | (3,344) |  |  |  | (3,344)
Restricted stock unit withholdings (in shares) |  | (89,000) |  |  |
Issuance of common stock under stock-based compensation plans | 4,371 |  | 4,371 |  |
Issuance of common stock under stock-based compensation plans (in shares) |  | 430,000 |  |  |
Ending balance at Mar. 31, 2019 | 632,908 | $ 32 | 804,413 | 14 | (171,551)
Ending balance (in shares) at Mar. 31, 2019 |  | 31,467,000 |  |  |
Beginning balance at Dec. 31, 2018 | 627,552 | $ 32 | 793,585 | (15) | (166,050)
Beginning balance (in shares) at Dec. 31, 2018 |  | 31,562,000 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Repurchase of common stock | $ (32,000) |  |  |  |
Repurchase of common stock (in shares) | (1,000,000.0) |  |  |  |
Restricted stock unit withholdings (in shares) | (168,000) |  |  |  |
Ending balance at Jun. 30, 2019 | $ 622,072 | $ 31 | 812,034 | 12 | (190,005)
Ending balance (in shares) at Jun. 30, 2019 |  | 31,110,000 |  |  |
Beginning balance at Mar. 31, 2019 | 632,908 | $ 32 | 804,413 | 14 | (171,551)
Beginning balance (in shares) at Mar. 31, 2019 |  | 31,467,000 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Change in unrealized gains and losses on derivatives, net of tax | (2) |  |  | (2) |
Net income (loss) | 839 |  |  |  | 839
Stock-based compensation | 6,739 |  | 6,739 |  |
Repurchase of common stock | (16,980) | $ (1) |  |  | (16,979)
Repurchase of common stock (in shares) |  | (570,000) |  |  |
Restricted stock unit withholdings | (2,314) |  |  |  | (2,314)
Restricted stock unit withholdings (in shares) |  | (79,000) |  |  |
Issuance of common stock under stock-based compensation plans | 882 |  | 882 |  |
Issuance of common stock under stock-based compensation plans (in shares) |  | 292,000 |  |  |
Ending balance at Jun. 30, 2019 | 622,072 | $ 31 | 812,034 | 12 | (190,005)
Ending balance (in shares) at Jun. 30, 2019 |  | 31,110,000 |  |  |
Beginning balance at Dec. 31, 2019 | 608,693 | $ 30 | 831,365 | 21 | (222,723)
Beginning balance (in shares) at Dec. 31, 2019 |  | 29,925,000 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Change in unrealized gains and losses on derivatives, net of tax | 350 |  |  | 350 |
Net income (loss) | (4,173) |  |  |  | (4,173)
Stock-based compensation | 6,336 |  | 6,336 |  |
Repurchase of common stock | (15,008) |  |  |  | (15,008)
Repurchase of common stock (in shares) |  | (584,000) |  |  |
Restricted stock unit withholdings | (1,347) |  |  |  | (1,347)
Restricted stock unit withholdings (in shares) |  | (54,000) |  |  |
Issuance of common stock under stock-based compensation plans | 2,940 |  | 2,940 |  |
Issuance of common stock under stock-based compensation plans (in shares) |  | 305,000 |  |  |
Ending balance at Mar. 29, 2020 | 597,791 | $ 30 | 840,641 | 371 | (243,251)
Ending balance (in shares) at Mar. 29, 2020 |  | 29,592,000 |  |  |
Beginning balance at Dec. 31, 2019 | 608,693 | $ 30 | 831,365 | 21 | (222,723)
Beginning balance (in shares) at Dec. 31, 2019 |  | 29,925,000 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Repurchase of common stock | $ (22,500) |  |  |  |
Repurchase of common stock (in shares) | (900,000) |  |  |  |
Restricted stock unit withholdings (in shares) | (149,000) |  |  |  |
Ending balance at Jun. 28, 2020 | $ 606,146 | $ 30 | 853,137 | 7 | (247,028)
Ending balance (in shares) at Jun. 28, 2020 |  | 29,684,000 |  |  |
Beginning balance at Mar. 29, 2020 | 597,791 | $ 30 | 840,641 | 371 | (243,251)
Beginning balance (in shares) at Mar. 29, 2020 |  | 29,592,000 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Change in unrealized gains and losses on derivatives, net of tax | (364) |  |  | (364) |
Net income (loss) | 5,983 |  |  |  | 5,983
Stock-based compensation | 9,172 |  | 9,172 |  |
Repurchase of common stock | (7,500) |  |  |  | (7,500)
Repurchase of common stock (in shares) |  | (315,000) |  |  |
Restricted stock unit withholdings | (2,260) |  |  |  | (2,260)
Restricted stock unit withholdings (in shares) |  | (95,000) |  |  |
Issuance of common stock under stock-based compensation plans | 3,324 |  | 3,324 |  |
Issuance of common stock under stock-based compensation plans (in shares) |  | 502,000 |  |  |
Ending balance at Jun. 28, 2020 | $ 606,146 | $ 30 | $ 853,137 | $ 7 | $ (247,028)
Ending balance (in shares) at Jun. 28, 2020 |  | 29,684,000 |  |  |

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