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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 2022
--- | --- | --- | --- | --- | --- | --- | ---
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) |  |
Cumulative effect to retained earnings related to adoption of Topic 718 | Accounting Standards Update 2018-07 | [1] | 1,400 |  |  | 1,400 |  |  |
Common Stock, Ending at Jan. 01, 2019 |  |  | 87,057 |  |  |  |  |
Balance at Jan. 01, 2019 |  | 229,650 | $ 87 | 2,296,795 | (2,066,016) | (1,216) |  |
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) |  |
Net loss |  | (23,151) |  |  | (23,151) |  |  |
Other comprehensive loss, net of tax |  | (438) |  |  |  | (438) |  |
Issuance of common stock under option, stock award and purchase plans, Shares |  |  | 2,017 |  |  |  |  |
Issuance of common stock under option, stock award and purchase plans, Value |  | 1,319 | $ 2 | 1,317 |  |  |  |
Stock-based compensation |  | 4,686 |  | 4,686 |  |  |  |
Common Stock, Ending at Jun. 28, 2019 |  |  | 89,074 |  |  |  |  |
Balance at Jun. 28, 2019 |  | 212,066 | $ 89 | 2,302,798 | (2,089,167) | (1,654) |  |
Common Stock, Beginning at Mar. 29, 2019 |  |  | 88,784 |  |  |  |  |
Balance at Mar. 29, 2019 |  | 220,561 | $ 89 | 2,300,259 | (2,077,322) | (2,465) |  |
Net loss |  | (11,845) |  |  | (11,845) |  |  |
Other comprehensive loss, net of tax |  | 811 |  |  |  | 811 |  |
Issuance of common stock under option, stock award and purchase plans, Shares |  |  | 290 |  |  |  |  |
Issuance of common stock under option, stock award and purchase plans, Value |  |  | $ 0 |  |  |  |  |
Restricted Stock, Value, Shares Issued Net of Tax Withholdings |  | (36) |  | (36) |  |  |  |
Stock-based compensation |  | 2,575 |  | 2,575 |  |  |  |
Common Stock, Ending at Jun. 28, 2019 |  |  | 89,074 |  |  |  |  |
Balance at Jun. 28, 2019 |  | 212,066 | $ 89 | 2,302,798 | (2,089,167) | (1,654) |  |
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) |  |
Net loss |  | (37,355) |  |  | (37,355) |  |  |
Other comprehensive loss, net of tax |  | (311) |  |  |  | (311) |  |
Issuance of common stock under option, stock award and purchase plans, Shares |  |  | 2,575 |  |  |  |  |
Issuance of common stock under option, stock award and purchase plans, Value |  | 1,951 | $ 3 | 1,948 |  |  |  |
Stock-based compensation |  | 9,796 |  | 9,796 |  |  |  |
Conversion feature of 4.375% Convertible Senior Notes due 2022 |  | 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 |  |  |  |  |
Adjustments to Additional Paid in Capital, Warrant Issued |  | 0 |  | (2) |  |  |  |
Reclassification from mezzanine equity to equity for 4.00% Convertible Senior Notes due in 2020 |  | 2,410 |  | 2,410 |  |  |  |
Common Stock, Ending at Jun. 26, 2020 |  |  | 96,863 |  |  |  |  |
Balance at Jun. 26, 2020 |  | 230,282 | $ 97 | 2,342,856 | (2,109,295) | (3,376) |  |
Common Stock, Beginning at Mar. 27, 2020 |  |  | 96,566 |  |  |  |  |
Balance at Mar. 27, 2020 |  | 236,322 | $ 97 | 2,336,459 | (2,093,894) | (6,340) |  |
Net loss |  | (15,401) |  |  | (15,401) |  |  |
Other comprehensive loss, net of tax |  | 2,964 |  |  |  | 2,964 |  |
Issuance of common stock under option, stock award and purchase plans, Shares |  |  | 297 |  |  |  |  |
Issuance of common stock under option, stock award and purchase plans, Value |  |  | $ 0 |  |  |  |  |
Restricted Stock, Value, Shares Issued Net of Tax Withholdings |  | (220) |  | (220) |  |  |  |
Stock-based compensation |  | 3,495 |  | 3,495 |  |  |  |
Conversion feature of 4.375% Convertible Senior Notes due 2022 |  | 8,254 |  | 8,254 |  |  |  |
Portion of conversion feature of 4.00% Convertible Senior Notes due 2020 exchanged |  | (6,909) |  | (6,909) |  |  |  |
Reclassification from mezzanine equity to equity for 4.00% Convertible Senior Notes due in 2020 |  | 1,777 |  | 1,777 |  |  |  |
Common Stock, Ending at Jun. 26, 2020 |  |  | 96,863 |  |  |  |  |
Balance at Jun. 26, 2020 |  | $ 230,282 | $ 97 | $ 2,342,856 | $ (2,109,295) | $ (3,376) |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 4.00% | 4.375%
[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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