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Condensed Consolidated Statements of Changes in Equity (Unaudited) - USD ($) $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjustment [Member] | Common Stock [Member] | Common Stock [Member] Cumulative Effect, Period of Adoption, Adjustment [Member] | Additional Paid-in Capital [Member] | Additional Paid-in Capital [Member] Cumulative Effect, Period of Adoption, Adjustment [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Accumulated Other Comprehensive Income (Loss) [Member] Cumulative Effect, Period of Adoption, Adjustment [Member] | Accumulated Deficit [Member] | Accumulated Deficit [Member] Cumulative Effect, Period of Adoption, Adjustment [Member] | Noncontrolling Interests [Member] | Noncontrolling Interests [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2018 | $ 528,470 |  | $ 854 |  | $ 1,226,453 |  | $ (2,281) |  | $ (715,827) |  | $ 19,271 |
Balance (ASU 2016-02 [Member]) at Dec. 31, 2018 |  | $ 8,688 |  | $ 0 |  | $ 0 |  | $ 0 |  | $ 8,688 |  | $ 0
Balance (ASU 2018-02 [Member]) at Dec. 31, 2018 |  | $ 0 |  | $ 0 |  | $ 0 |  | $ 611 |  | $ (611) |  | $ 0
Balance, Shares at Dec. 31, 2018 |  |  | 85,432,102 |  |  |  |  |  |  |  |  |
Net income (loss) | 21,153 |  | $ 0 |  | 0 |  | 0 |  | 21,153 |  | 0 |
Change in unrealized gain or loss on investments | 712 |  | 0 |  | 0 |  | 712 |  | 0 |  | 0 |
Foreign currency translation adjustments | 734 |  | 0 |  | 0 |  | 734 |  | 0 |  | 0 |
Shares issued from stock plans, net of payroll taxes paid | 5,096 |  | $ 18 |  | 5,078 |  | 0 |  | 0 |  | 0 |
Shares issued from stock plans, net of payroll taxes paid, Shares |  |  | 1,778,567 |  |  |  |  |  |  |  |  |
Stock-based compensation | 48,865 |  | $ 0 |  | 48,865 |  | 0 |  | 0 |  | 0 |
Balance at Sep. 30, 2019 | 613,718 |  | $ 872 |  | 1,280,396 |  | (224) |  | (686,597) |  | 19,271 |
Balance, Shares at Sep. 30, 2019 |  |  | 87,210,669 |  |  |  |  |  |  |  |  |
Balance at Jun. 30, 2019 | 648,302 |  | $ 868 |  | 1,265,783 |  | (462) |  | (637,158) |  | 19,271 |
Balance, Shares at Jun. 30, 2019 |  |  | 86,847,072 |  |  |  |  |  |  |  |  |
Net income (loss) | (49,439) |  | $ 0 |  | 0 |  | 0 |  | (49,439) |  | 0 |
Change in unrealized gain or loss on investments | (385) |  | 0 |  | 0 |  | (385) |  | 0 |  | 0 |
Foreign currency translation adjustments | 623 |  | 0 |  | 0 |  | 623 |  | 0 |  | 0 |
Shares issued from stock plans, net of payroll taxes paid | (176) |  | $ 4 |  | (180) |  | 0 |  | 0 |  | 0 |
Shares issued from stock plans, net of payroll taxes paid, Shares |  |  | 363,597 |  |  |  |  |  |  |  |  |
Stock-based compensation | 14,793 |  | $ 0 |  | 14,793 |  | 0 |  | 0 |  | 0 |
Balance at Sep. 30, 2019 | 613,718 |  | $ 872 |  | 1,280,396 |  | (224) |  | (686,597) |  | 19,271 |
Balance, Shares at Sep. 30, 2019 |  |  | 87,210,669 |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2019 | 535,406 |  | $ 877 |  | 1,300,725 |  | (747) |  | (784,720) |  | 19,271 |
Balance, Shares at Dec. 31, 2019 |  |  | 87,657,489 |  |  |  |  |  |  |  |  |
Net income (loss) | (130,657) |  | $ 0 |  | 0 |  | 0 |  | (130,657) |  | 0 |
Change in unrealized gain or loss on investments | (137) |  | 0 |  | 0 |  | (137) |  | 0 |  | 0 |
Foreign currency translation adjustments | (3,372) |  | 0 |  | 0 |  | (3,372) |  | 0 |  | 0 |
Shares issued from stock plans, net of payroll taxes paid | 17,240 |  | $ 32 |  | 17,208 |  | 0 |  | 0 |  | 0 |
Shares issued from stock plans, net of payroll taxes paid, Shares |  |  | 3,227,267 |  |  |  |  |  |  |  |  |
Stock-based compensation | 52,451 |  | $ 0 |  | 52,451 |  | 0 |  | 0 |  | 0 |
Balance at Sep. 30, 2020 | 470,931 |  | $ 909 |  | 1,370,384 |  | (4,256) |  | (915,377) |  | 19,271 |
Balance, Shares at Sep. 30, 2020 |  |  | 90,884,756 |  |  |  |  |  |  |  |  |
Balance at Jun. 30, 2020 | 415,143 |  | $ 902 |  | 1,344,912 |  | (1,561) |  | (948,381) |  | 19,271 |
Balance, Shares at Jun. 30, 2020 |  |  | 90,228,293 |  |  |  |  |  |  |  |  |
Net income (loss) | 33,004 |  | $ 0 |  | 0 |  | 0 |  | 33,004 |  | 0 |
Change in unrealized gain or loss on investments | (657) |  | 0 |  | 0 |  | (657) |  | 0 |  | 0 |
Foreign currency translation adjustments | (2,038) |  | 0 |  | 0 |  | (2,038) |  | 0 |  | 0 |
Shares issued from stock plans, net of payroll taxes paid | 7,588 |  | $ 7 |  | 7,581 |  | 0 |  | 0 |  | 0 |
Shares issued from stock plans, net of payroll taxes paid, Shares |  |  | 656,463 |  |  |  |  |  |  |  |  |
Stock-based compensation | 17,891 |  | $ 0 |  | 17,891 |  | 0 |  | 0 |  | 0 |
Balance at Sep. 30, 2020 | $ 470,931 |  | $ 909 |  | $ 1,370,384 |  | $ (4,256) |  | $ (915,377) |  | $ 19,271 |
Balance, Shares at Sep. 30, 2020 |  |  | 90,884,756 |  |  |  |  |  |  |  |  |

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