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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Deficit [Member] | Accumulated Other Comprehensive Loss [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] Accumulated Deficit [Member] | Convertible Note due 2020 [Member] | Convertible Note due 2024 [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance, Shares at Dec. 31, 2016 |  |  | 78,456 |  |  |  |  |  |  |
Balance, Shares at Jan. 01, 2017 |  |  | 78,456 |  |  |  |  |  |  |
Balance at Dec. 31, 2016 |  | $ 270,641 | $ 78 | $ 2,254,055 | $ (1,976,222) | $ (7,270) |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax | Accounting Standards Update 2016-09 [Member] |  |  |  | 69 | (69) |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax | Accounting Standards Update 2016-16 [Member] |  | 1,434 |  |  | 1,434 |  |  |  |  |
Balance at Jan. 01, 2017 |  | 272,075 | $ 78 | 2,254,124 | (1,974,857) | (7,270) |  |  |  |
Balance, Shares at Dec. 31, 2016 |  |  | 78,456 |  |  |  |  |  |  |
Balance, Shares at Dec. 31, 2017 |  |  | 82,554 |  |  |  |  |  |  |
Balance at Dec. 31, 2016 |  | 270,641 | $ 78 | 2,254,055 | (1,976,222) | (7,270) |  |  |  |
Net loss |  | (82,955) |  |  | (82,955) |  |  |  |  |
Other Comprehensive income or loss, net of tax |  | 10,652 |  |  |  | 10,652 |  |  |  |
Issuance of Common Stock under option, stock award and purchase plans |  | 1,959 | $ 5 | 1,954 |  |  |  |  |  |
Issuance of Common Stock under option, stock award and purchase plans, Shares |  |  | 4,098 |  |  |  |  |  |  |
Stock-based compensation |  | 16,612 |  | 16,612 |  |  |  |  |  |
Issuance of warrant |  | 0 |  |  |  |  |  |  |  |
Balance at Dec. 31, 2017 |  | 218,343 | $ 83 | 2,272,690 | (2,057,812) | 3,382 |  |  |  |
Balance, Shares at Jan. 01, 2018 |  |  | 82,554 |  |  |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax | Accounting Standards Update 2014-09 [Member] | [1] |  |  |  |  |  | $ 11,431 | $ 11,431 |  |
Balance at Jan. 01, 2018 |  | 229,774 | $ 83 | 2,272,690 | (2,046,381) | 3,382 |  |  |  |
Balance, Shares at Dec. 31, 2017 |  |  | 82,554 |  |  |  |  |  |  |
Balance, Shares at Dec. 31, 2018 |  |  | 87,057 |  |  |  |  |  |  |
Balance at Dec. 31, 2017 |  | 218,343 | $ 83 | 2,272,690 | (2,057,812) | 3,382 |  |  |  |
Net loss |  | (21,035) |  |  | (21,035) |  |  |  |  |
Other Comprehensive income or loss, net of tax |  | (4,598) |  |  |  | (4,598) |  |  |  |
Issuance of Common Stock under option, stock award and purchase plans |  | 4,717 | $ 4 | 4,713 |  |  |  |  |  |
Issuance of Common Stock under option, stock award and purchase plans, Shares |  |  | 4,503 |  |  |  |  |  |  |
Stock-based compensation |  | 17,097 |  | 17,097 |  |  |  |  |  |
Issuance of warrant |  | 2,295 |  | 2,295 |  |  |  |  |  |
Balance at Dec. 31, 2018 |  | 228,250 | $ 87 | 2,296,795 | (2,067,416) | (1,216) |  |  |  |
Balance, Shares at Jan. 01, 2019 |  |  | 87,057 |  |  |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax | Accounting Standards Update 2016-09 [Member] | [2] | 1,400 |  |  | 1,400 |  |  |  |  |
Balance at Jan. 01, 2019 |  | 229,650 | $ 87 | 2,296,795 | (2,066,016) | (1,216) |  |  |  |
Balance, Shares at Dec. 31, 2018 |  |  | 87,057 |  |  |  |  |  |  |
Balance, Shares at Dec. 31, 2019 |  |  | 91,875 |  |  |  |  |  |  |
Balance at Dec. 31, 2018 |  | 228,250 | $ 87 | 2,296,795 | (2,067,416) | (1,216) |  |  |  |
Net loss |  | (5,924) |  |  | (5,924) |  |  |  |  |
Other Comprehensive income or loss, net of tax |  | (1,849) |  |  |  |  |  |  |  |
Issuance of Common Stock under option, stock award and purchase plans |  | 6,914 | $ 4 | 6,910 |  |  |  |  |  |
Issuance of Common Stock under option, stock award and purchase plans, Shares |  |  | 4,014 |  |  |  |  |  |  |
Stock-based compensation |  | 12,156 |  | 12,156 |  |  |  |  |  |
Issuance of warrant |  | 16,142 |  | 16,142 |  |  |  |  |  |
Exercise of warrants |  |  | 804 |  |  |  |  |  |  |
Exercise of warrant, Amount |  |  | $ 1 |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital - Exercise of Warrants |  | 0 |  | (1) |  |  |  |  |  |
Reclassification from equity to mezzanine equity for 4.00% Convertible Senior Notes due in 2020 |  | (2,410) |  | (2,410) |  |  |  |  |  |
Portion of repurchase price recorded in additional paid-in capital in connection with partial repurchase of 4.00% convertible notes due 2020 |  | (27,111) |  | (27,111) |  |  |  |  |  |
Conversion feature of 2.00% convertible notes due 2024 |  | 24,878 |  | 24,878 |  |  |  |  |  |
Balance at Dec. 31, 2019 |  | 252,446 | $ 92 | 2,327,359 | (2,071,940) | (3,065) |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  | 2.00%
Balance, Shares at Dec. 31, 2019 |  |  | 91,875 |  |  |  |  |  |  |
Net loss |  | 5,570 |  |  |  |  |  |  |  |
Balance at Dec. 31, 2019 |  | $ 252,446 | $ 92 | $ 2,327,359 | $ (2,071,940) | $ (3,065) |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  | 4.00% | 2.00%
[1] | See Note 2, “Summary of Significant Accounting Policies-Recently Adopted Accounting Pronouncements,” for more information on the adoption of ASC 606, Revenue from Contracts with Customers (“Topic 606”) issued by the Financial Accounting Standards Board.
[2] | See Note 2, “Summary of Significant Accounting Policies-Recently Adopted Accounting Pronouncements,” for more information on the adoption of ASC 718, Compensation-Stock Compensation (“Topic 718”) issued by the Financial Accounting Standards Board.

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