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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 loss (163,661) $ 0 0 0 (163,661) 0
Change in unrealized gain or loss on investments 520 0 0 520 0 0
Foreign currency translation adjustments (1,334) 0 0 (1,334) 0 0
Shares issued from stock plans, net of payroll taxes paid 9,652 $ 25 9,627 0 0 0
Shares issued from stock plans, net of payroll taxes paid, Shares   2,570,804        
Stock-based compensation 34,560 $ 0 34,560 0 0 0
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        
Balance at Mar. 31, 2020 477,629 $ 889 1,319,354 1,183 (863,068) 19,271
Balance, Shares at Mar. 31, 2020   88,895,630        
Net loss (85,313) $ 0 0 0 (85,313) 0
Change in unrealized gain or loss on investments (1,129) 0 0 (1,129) 0 0
Foreign currency translation adjustments (1,615) 0 0 (1,615) 0 0
Shares issued from stock plans, net of payroll taxes paid 7,927 $ 13 7,914 0 0 0
Shares issued from stock plans, net of payroll taxes paid, Shares   1,332,663        
Stock-based compensation 17,644 $ 0 17,644 0 0 0
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        
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 loss (205,743) $ 0 0 0 (205,743) 0
Change in unrealized gain or loss on investments (38) 0 0 (38) 0 0
Foreign currency translation adjustments (30) 0 0 (30) 0 0
Shares issued from stock plans, net of payroll taxes paid 5,828 $ 12 5,816 0 0 0
Shares issued from stock plans, net of payroll taxes paid, Shares   1,168,296        
Stock-based compensation 38,385 $ 0 38,385 0 0 0
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        
Balance at Mar. 31, 2021 390,273 $ 921 1,420,471 (4,624) (1,045,766) 19,271
Balance, Shares at Mar. 31, 2021   92,080,399        
Net loss (133,988) $ 0 0 0 (133,988) 0
Change in unrealized gain or loss on investments 17 0 0 17 0 0
Foreign currency translation adjustments 40 0 0 40 0 0
Shares issued from stock plans, net of payroll taxes paid 4,508 $ 5 4,503 0 0 0
Shares issued from stock plans, net of payroll taxes paid, Shares   528,530        
Stock-based compensation 19,001 $ 0 19,001 0 0 0
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