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Condensed Consolidated Statements of Changes in Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Deficit [Member]
Noncontrolling Interests [Member]
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        
Balance at Dec. 31, 2020 441,449 $ 914 1,399,774 (4,499) (974,011) 19,271
Balance, Shares at Dec. 31, 2020   91,440,633        
Net income (loss) (155,945) $ 0 0 0 (155,945) 0
Change in unrealized gain or loss on investments (25) 0 0 (25) 0 0
Foreign currency translation adjustments 366 0 0 366 0 0
Shares issued from stock plans, net of payroll taxes paid 5,129 $ 13 5,116 0 0 0
Shares issued from stock plans, net of payroll taxes paid, Shares   1,267,319        
Stock-based compensation 54,089 $ 0 54,089 0 0 0
Balance at Sep. 30, 2021 345,063 $ 927 1,458,979 (4,158) (1,129,956) 19,271
Balance, Shares at Sep. 30, 2021   92,707,952        
Balance at Jun. 30, 2021 279,851 $ 926 1,443,975 (4,567) (1,179,754) 19,271
Balance, Shares at Jun. 30, 2021   92,608,929        
Net income (loss) 49,798 $ 0 0 0 49,798 0
Change in unrealized gain or loss on investments 13 0 0 13 0 0
Foreign currency translation adjustments 396 0 0 396 0 0
Shares issued from stock plans, net of payroll taxes paid (699) $ 1 (700) 0 0 0
Shares issued from stock plans, net of payroll taxes paid, Shares   99,023        
Stock-based compensation 15,704 $ 0 15,704 0 0 0
Balance at Sep. 30, 2021 $ 345,063 $ 927 $ 1,458,979 $ (4,158) $ (1,129,956) $ 19,271
Balance, Shares at Sep. 30, 2021   92,707,952