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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Loss [Member]
Accumulated Deficit [Member]
Noncontrolling Interests [Member]
Balance at Dec. 31, 2017 $ 547,738 $ 825 $ 1,160,094 $ (1,795) $ (630,657) $ 19,271
Balance, Shares at Dec. 31, 2017   82,498,128        
Impact of change in accounting principle upon adoption | ASU 2016-01 [Member] 0 $ 0 0 (1,250) 1,250 0
Net income (loss) (107,373) 0 0 0 (107,373) 0
Change in unrealized gain or loss on investments (28) 0 0 (28) 0 0
Foreign currency translation adjustments 503 0 0 503 0 0
Shares issued from stock plans, net of payroll taxes paid 11,310 $ 23 11,287 0 0 0
Shares issued from stock plans, net of payroll taxes paid, Shares   2,348,614        
Stock-based compensation 38,432 $ 0 38,432 0 0 0
Balance at Sep. 30, 2018 490,582 $ 848 1,209,813 (2,570) (736,780) 19,271
Balance, Shares at Sep. 30, 2018   84,846,742        
Balance at Jun. 30, 2018 514,802 $ 842 1,191,524 (2,611) (694,224) 19,271
Balance, Shares at Jun. 30, 2018   84,182,844        
Net income (loss) (42,556) $ 0 0 0 (42,556) 0
Change in unrealized gain or loss on investments (31) 0 0 (31) 0 0
Foreign currency translation adjustments 72 0 0 72 0 0
Shares issued from stock plans, net of payroll taxes paid 3,972 $ 6 3,966 0 0 0
Shares issued from stock plans, net of payroll taxes paid, Shares   663,898        
Stock-based compensation 14,323 $ 0 14,323 0 0 0
Balance at Sep. 30, 2018 490,582 $ 848 1,209,813 (2,570) (736,780) 19,271
Balance, Shares at Sep. 30, 2018   84,846,742        
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 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