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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) (64,817) 0 0 0 (64,817) 0
Change in unrealized gain or loss on investments 3 0 0 3 0 0
Foreign currency translation adjustments 431 0 0 431 0 0
Shares issued from stock plans, net of payroll taxes paid 7,338 $ 17 7,321 0 0 0
Shares issued from stock plans, net of payroll taxes paid, Shares   1,684,716        
Stock-based compensation 24,109 $ 0 24,109 0 0 0
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        
Balance at Mar. 31, 2018 518,789 $ 834 1,173,109 (3,622) (670,803) 19,271
Balance, Shares at Mar. 31, 2018   83,420,625        
Net income (loss) (23,421) $ 0 0 0 (23,421) 0
Change in unrealized gain or loss on investments 53 0 0 53 0 0
Foreign currency translation adjustments 958 0 0 958 0 0
Shares issued from stock plans, net of payroll taxes paid 5,192 $ 8 5,184 0 0 0
Shares issued from stock plans, net of payroll taxes paid, Shares   762,219        
Stock-based compensation 13,231 $ 0 13,231 0 0 0
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        
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) 70,592 0 0 0 70,592 0
Change in unrealized gain or loss on investments 1,097 0 0 1,097 0 0
Foreign currency translation adjustments 111 0 0 111 0 0
Shares issued from stock plans, net of payroll taxes paid 5,272 $ 14 5,258 0 0 0
Shares issued from stock plans, net of payroll taxes paid, Shares   1,414,970        
Stock-based compensation 34,072 $ 0 34,072 0 0 0
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        
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        
Net income (loss) 116,003 $ 0 0 0 116,003 0
Change in unrealized gain or loss on investments 655 0 0 655 0 0
Foreign currency translation adjustments (180) 0 0 (180) 0 0
Shares issued from stock plans, net of payroll taxes paid 5,688 $ 7 5,681 0 0 0
Shares issued from stock plans, net of payroll taxes paid, Shares   717,508        
Stock-based compensation 17,642 $ 0 17,642 0 0 0
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