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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | AOCI Attributable to Parent [Member] | Convertible Note due 2020 | Convertible Note due 2020 Additional Paid-in Capital [Member] | Convertible Note due 2022 | Convertible Note due 2022 Additional Paid-in Capital [Member] | Convertible Note due 2024 | Convertible Note due 2024 Additional Paid-in Capital [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | [1] | Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member] | [1] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Common Stock [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Additional Paid-in Capital [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] AOCI Attributable to Parent [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Common Stock, Beginning at Dec. 31, 2018 |  | 87,057 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2018 | $ 228,250 | $ 87 | $ 2,296,795 | $ (2,067,416) | $ (1,216) |  |  |  |  |  |  | $ 1,400 | $ 1,400 | $ 229,650 | $ 87 | $ 2,296,795 | $ (2,066,016) | $ (1,216)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ (11,494) |  |  | (11,494) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201807Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive loss, net of tax | $ (4,153) |  |  |  | (4,153) |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under option, stock award and purchase plans, Shares |  | 3,258 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under option, stock award and purchase plans, Value | 4,295 | $ 3 | 4,292 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation | 8,843 |  | 8,843 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Warrant Issued | 16,142 |  | 16,142 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion feature of Convertible Senior Notes |  |  |  |  |  |  |  |  |  | $ 24,878 | $ 24,878 |  |  |  |  |  |  |
Portion of conversion feature of 4.00% Convertible Senior Notes due 2020 exchanged |  |  |  |  |  | $ 27,111 | $ 27,111 |  |  |  |  |  |  |  |  |  |  |
Issuance of warrant, amount | 16,142 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Ending at Sep. 27, 2019 |  | 90,315 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Sep. 27, 2019 | 241,050 | $ 90 | 2,323,839 | (2,077,510) | (5,369) |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Beginning at Jun. 28, 2019 |  | 89,074 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Jun. 28, 2019 | 212,066 | $ 89 | 2,302,798 | (2,089,167) | (1,654) |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | 11,657 |  |  | 11,657 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive loss, net of tax | (3,715) |  |  |  | (3,715) |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under option, stock award and purchase plans, Shares |  | 1,241 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under option, stock award and purchase plans, Value | 2,976 | $ 1 | 2,975 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation | 4,157 |  | 4,157 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Warrant Issued | 16,142 |  | 16,142 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion feature of Convertible Senior Notes |  |  |  |  |  |  |  |  |  | $ 24,878 | $ 24,878 |  |  |  |  |  |  |
Portion of conversion feature of 4.00% Convertible Senior Notes due 2020 exchanged |  |  |  |  |  | (27,111) | (27,111) |  |  |  |  |  |  |  |  |  |  |
Common Stock, Ending at Sep. 27, 2019 |  | 90,315 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Sep. 27, 2019 | 241,050 | $ 90 | 2,323,839 | (2,077,510) | (5,369) |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Beginning at Dec. 31, 2019 |  | 91,875 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2019 | 252,446 | $ 92 | 2,327,359 | (2,071,940) | (3,065) |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | (42,736) |  |  | (42,736) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive loss, net of tax | 3,462 |  |  |  | 3,462 |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under option, stock award and purchase plans, Shares |  | 3,444 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under option, stock award and purchase plans, Value | 3,843 | $ 4 | 3,839 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation | 13,768 |  | 13,768 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Warrant Issued | 0 |  | (2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion feature of Convertible Senior Notes |  |  |  |  |  |  |  | $ 8,254 | $ 8,254 |  |  |  |  |  |  |  |  |
Portion of conversion feature of 4.00% Convertible Senior Notes due 2020 exchanged |  |  |  |  |  | (6,909) | (6,909) |  |  |  |  |  |  |  |  |  |  |
Issuance of warrant, shares |  | 2,413 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of warrant, amount |  | $ 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Redeemed or Called During Period, Value |  |  |  |  |  | 2,329 | 2,329 |  |  |  |  |  |  |  |  |  |  |
Common Stock, Ending at Sep. 25, 2020 |  | 97,732 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Sep. 25, 2020 | 234,457 | $ 98 | 2,348,638 | (2,114,676) | 397 |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Beginning at Jun. 26, 2020 |  | 96,863 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Jun. 26, 2020 | 230,282 | $ 97 | 2,342,856 | (2,109,295) | (3,376) |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | (5,381) |  |  | (5,381) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive loss, net of tax | 3,773 |  |  |  | 3,773 |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under option, stock award and purchase plans, Shares |  | 869 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under option, stock award and purchase plans, Value | 1,892 | $ 1 | 1,891 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation | 3,972 |  | 3,972 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Portion of conversion feature of 4.00% Convertible Senior Notes due 2020 exchanged |  |  |  |  |  | $ (81) | $ (81) |  |  |  |  |  |  |  |  |  |  |
Common Stock, Ending at Sep. 25, 2020 |  | 97,732 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Sep. 25, 2020 | $ 234,457 | $ 98 | $ 2,348,638 | $ (2,114,676) | $ 397 |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | See Note 2, “Summary of Significant Accounting Policies - Recently Adopted Accounting Pronouncements” on Form 10-K for the year ended December 31, 2019 for more information on the adoption of Accounting Standard Update (“ASU”) No. 2018-07, Compensation-Stock Compensation (“Topic 718”): Improvements to Nonemployee Share-Based Payment Accounting issued by the Financial Accounting Standards Board.

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