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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 (78,348) $ 0 0 0 (78,348) 0
Change in unrealized gain or loss on investments 1,649 0 0 1,649 0 0
Foreign currency translation adjustments 281 0 0 281 0 0
Shares issued from stock plans, net of payroll taxes paid 1,725 $ 12 1,713 0 0 0
Shares issued from stock plans, net of payroll taxes paid, Shares   1,238,141        
Stock-based compensation 16,916 $ 0 16,916 0 0 0
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        
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 (71,755) $ 0 0 0 (71,755) 0
Change in unrealized gain or loss on investments (55) 0 0 (55) 0 0
Foreign currency translation adjustments (70) 0 0 (70) 0 0
Shares issued from stock plans, net of payroll taxes paid 1,320 $ 7 1,313 0 0 0
Shares issued from stock plans, net of payroll taxes paid, Shares   639,766        
Stock-based compensation 19,384 $ 0 19,384 0 0 0
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