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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, 2018 $ 528,470 $ 854 $ 1,226,453 $ (2,281) $ (715,827) $ 19,271
Balance, Shares at Dec. 31, 2018   85,432,102        
Impact of change in accounting principle upon adoption | ASU 2016-02 [Member] 8,688 $ 0 0 0 8,688 0
Impact of change in accounting principle upon adoption | ASU 2018-02 [Member] 0 0 0 611 (611) 0
Net loss (45,411) 0 0 0 (45,411) 0
Change in unrealized gain or loss on investments 442 0 0 442 0 0
Foreign currency translation adjustments 291 0 0 291 0 0
Shares issued from stock plans, net of payroll taxes paid (416) $ 7 (423) 0 0 0
Shares issued from stock plans, net of payroll taxes paid, Shares   697,462        
Stock-based compensation 16,430 $ 0 16,430 0 0 0
Balance at Mar. 31, 2019 508,494 $ 861 1,242,460 (937) (753,161) 19,271
Balance, Shares at Mar. 31, 2019   86,129,564        
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