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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Treasury Stock | Accumulated Deficit | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | --- | ---
Balance, beginning of period (in shares) at Sep. 28, 2019 |  | 109,623,417 |  | 1,020,775 |  |
Balance, beginning of period at Sep. 28, 2019 | $ 280,928 | $ 110 | $ 502,757 | $ (13,498) | $ (208,377) | $ (64)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of common stock pursuant to equity incentive plans (in shares) |  | 1,561,696 |  |  |  |
Issuance of common stock pursuant to equity incentive plans | 7,969 | $ 1 | 7,968 |  |  |
Purchase of common stock (in shares) |  |  |  | (227,241) |  |
Repurchase of common stock | (2,926) |  |  | $ (2,926) |  |
Repurchase of common stock related to shares withheld for tax in connection with vesting of restricted stock unit awards ("RSUs") (in shares) |  |  |  | (144,908) |  |
Repurchase of common stock related to shares withheld for tax in connection with vesting of restricted stock unit awards ("RSUs") | (2,152) |  |  | $ (2,152) |  |
Stock-based compensation expense | 13,204 |  | 13,204 |  |  |
Net income (loss) | 70,775 |  |  |  | 70,775 |
Change in foreign currency translation adjustment | (519) |  |  |  |  | (519)
Balance, end of period (in shares) at Dec. 28, 2019 |  | 111,185,113 |  | 1,392,924 |  |
Balance, ending of period at Dec. 28, 2019 | 367,279 | $ 111 | 523,929 | $ (18,576) | (137,602) | (583)
Balance, beginning of period (in shares) at Sep. 28, 2019 |  | 109,623,417 |  | 1,020,775 |  |
Balance, beginning of period at Sep. 28, 2019 | 280,928 | $ 110 | 502,757 | $ (13,498) | (208,377) | (64)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) | 18,454 |  |  |  |  |
Change in foreign currency translation adjustment | (950) |  |  |  |  |
Balance, end of period (in shares) at Mar. 28, 2020 |  | 112,733,727 |  | 3,884,652 |  |
Balance, ending of period at Mar. 28, 2020 | 299,804 | $ 113 | 541,937 | $ (51,310) | (189,922) | (1,014)
Balance, beginning of period (in shares) at Dec. 28, 2019 |  | 111,185,113 |  | 1,392,924 |  |
Balance, beginning of period at Dec. 28, 2019 | 367,279 | $ 111 | 523,929 | $ (18,576) | (137,602) | (583)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of common stock pursuant to equity incentive plans (in shares) |  | 1,548,614 |  |  |  |
Issuance of common stock pursuant to equity incentive plans | 4,616 | $ 2 | 4,614 |  |  |
Purchase of common stock (in shares) |  |  |  | (2,309,604) |  |
Repurchase of common stock | (30,290) |  |  | $ (30,290) |  |
Repurchase of common stock related to shares withheld for tax in connection with vesting of restricted stock unit awards ("RSUs") (in shares) |  |  |  | (182,124) |  |
Repurchase of common stock related to shares withheld for tax in connection with vesting of restricted stock unit awards ("RSUs") | (2,444) |  |  | $ (2,444) |  |
Stock-based compensation expense | 13,394 |  | 13,394 |  |  |
Net income (loss) | (52,320) |  |  |  | (52,320) |
Change in foreign currency translation adjustment | (431) |  |  |  |  | (431)
Balance, end of period (in shares) at Mar. 28, 2020 |  | 112,733,727 |  | 3,884,652 |  |
Balance, ending of period at Mar. 28, 2020 | 299,804 | $ 113 | 541,937 | $ (51,310) | (189,922) | (1,014)
Balance, beginning of period (in shares) at Oct. 03, 2020 |  | 113,915,233 |  | 1,571,138 |  |
Balance, beginning of period at Oct. 03, 2020 | 297,839 | $ 114 | 548,993 | $ (20,886) | (228,492) | (1,890)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of common stock pursuant to equity incentive plans (in shares) |  | 7,075,338 |  |  |  |
Issuance of common stock pursuant to equity incentive plans | 69,505 | $ 7 | 69,498 |  |  |
Repurchase of common stock related to shares withheld for tax in connection with vesting of restricted stock unit awards ("RSUs") (in shares) |  |  |  | (307,980) |  |
Repurchase of common stock related to shares withheld for tax in connection with vesting of restricted stock unit awards ("RSUs") | (5,118) |  |  | $ (5,118) |  |
Stock-based compensation expense | 14,844 |  | 14,844 |  |  |
Net income (loss) | 132,292 |  |  |  | 132,292 |
Change in foreign currency translation adjustment | 847 |  |  |  |  | 847
Balance, end of period (in shares) at Jan. 02, 2021 |  | 120,990,571 |  | 1,879,118 |  |
Balance, ending of period at Jan. 02, 2021 | 510,209 | $ 121 | 633,335 | $ (26,004) | (96,200) | (1,043)
Balance, beginning of period (in shares) at Oct. 03, 2020 |  | 113,915,233 |  | 1,571,138 |  |
Balance, beginning of period at Oct. 03, 2020 | $ 297,839 | $ 114 | 548,993 | $ (20,886) | (228,492) | (1,890)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of common stock pursuant to equity incentive plans (in shares) | 10,829,628 |  |  |  |  |
Retirement of treasury stock (in shares) | 1,017,308 |  |  |  |  |
Purchase of common stock (in shares) | (19,547) |  |  |  |  |
Net income (loss) | $ 149,513 |  |  |  |  |
Change in foreign currency translation adjustment | 1,046 |  |  |  |  |
Balance, end of period (in shares) at Apr. 03, 2021 |  | 125,716,622 |  | 1,268,563 |  |
Balance, ending of period at Apr. 03, 2021 | 579,268 | $ 126 | 684,988 | $ (26,023) | (78,979) | (844)
Balance, beginning of period (in shares) at Jan. 02, 2021 |  | 120,990,571 |  | 1,879,118 |  |
Balance, beginning of period at Jan. 02, 2021 | 510,209 | $ 121 | 633,335 | $ (26,004) | (96,200) | (1,043)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of common stock pursuant to equity incentive plans (in shares) |  | 5,743,359 |  |  |  |
Issuance of common stock pursuant to equity incentive plans | 49,661 | $ 6 | 49,655 |  |  |
Retirement of treasury stock (in shares) |  | 1,017,308 |  | 1,017,308 |  |
Retirement of treasury stock | 0 | $ (1) | (14,365) | $ 14,366 |  |
Purchase of common stock (in shares) |  |  |  | (19,547) |  |
Repurchase of common stock | (682) |  |  | $ (682) |  |
Repurchase of common stock related to shares withheld for tax in connection with vesting of restricted stock unit awards ("RSUs") (in shares) |  |  |  | (387,206) |  |
Repurchase of common stock related to shares withheld for tax in connection with vesting of restricted stock unit awards ("RSUs") | (13,703) |  |  | $ (13,703) |  |
Stock-based compensation expense | 16,363 |  | 16,363 |  |  |
Net income (loss) | 17,221 |  |  |  | 17,221 |
Change in foreign currency translation adjustment | 199 |  |  |  |  | 199
Balance, end of period (in shares) at Apr. 03, 2021 |  | 125,716,622 |  | 1,268,563 |  |
Balance, ending of period at Apr. 03, 2021 | $ 579,268 | $ 126 | $ 684,988 | $ (26,023) | $ (78,979) | $ (844)

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