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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 |  |  |  |

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