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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