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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]
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
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 | (21,954) |  |  | (21,954) |  |  |  |  |
Other comprehensive loss, net of tax | (3,275) |  |  |  | (3,275) |  |  |  |
Issuance of common stock under stock option, award and purchase plans, Shares |  | 2,278 |  |  |  |  |  |  |
Issuance of common stock under stock option, award and purchase plans, Value | 2,171 | $ 3 | 2,168 |  |  |  |  |  |
Stock-based compensation | 6,301 |  | 6,301 |  |  |  |  |  |
Exercise of warrant, shares |  | 2,413 |  |  |  |  |  |  |
Issuance of warrant, amount |  | $ 2 |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Other exercise of warrant | 0 |  | (2) |  |  |  |  |  |
Adjustment to APIC - Reclassification from Mezzanine Equity to Equity for 2020 Notes |  |  |  |  |  | $ 633 | $ 633 |  |
Common Stock, Ending at Mar. 27, 2020 |  | 96,566 |  |  |  |  |  |  |
Balance at Mar. 27, 2020 | 236,322 | $ 97 | 2,336,459 | (2,093,894) | (6,340) |  |  |  |
Common Stock, Beginning at Dec. 31, 2020 |  | 98,204 |  |  |  |  |  |  |
Balance at Dec. 31, 2020 | 258,302 | $ 98 | 2,353,559 | (2,101,211) | 5,856 |  |  |  |
Net loss | (6,124) |  |  | (6,124) |  |  |  |  |
Other comprehensive loss, net of tax | (3,981) |  |  |  | (3,981) |  |  |  |
Issuance of common stock under stock option, award and purchase plans, Shares |  | 2,789 |  |  |  |  |  |  |
Issuance of common stock under stock option, award and purchase plans, Value | 4,775 | $ 3 | 4,772 |  |  |  |  |  |
Stock-based compensation | 8,362 |  | 8,362 |  |  |  |  |  |
Adjustments to APIC - Reclassification from Equity to Mezzanine equity for 2022 Notes |  |  |  |  |  |  |  | $ (1,564) | $ (1,564)
Common Stock, Ending at Apr. 02, 2021 |  | 100,993 |  |  |  |  |  |  |
Balance at Apr. 02, 2021 | $ 259,770 | $ 101 | $ 2,365,129 | $ (2,107,335) | $ 1,875 |  |  |  |

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