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Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | Preferred Stock | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income (Loss) | Accumulated Deficit | Noncontrolling Interests | Series E Preferred Stock | Series E Preferred Stock Preferred Stock | Series E Preferred Stock Additional Paid-in Capital
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2018 | $ (36,525) | $ 0 | $ 74 | $ 546,230 | $ (4,877) | $ (577,817) | $ (135) |  |  |
Beginning Balance (shares) at Dec. 31, 2018 |  | 0 | 73,980,000 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net income (loss) | (7,471) |  |  |  |  | (7,485) | 14 |  |  |
Foreign currency translation adjustment | (583) |  |  |  | (583) |  |  |  |  |
Exercise of stock options and vesting of restricted stock units | 399 |  | $ 1 | 398 |  |  |  |  |  |
Exercise of stock options and vesting of restricted stock units (shares) |  |  | 497,000 |  |  |  |  |  |  |
Taxes withheld on net settled vesting of restricted stock units | (112) |  |  | (112) |  |  |  |  |  |
Exercise of warrants | 10,639 |  | $ 4 | 10,635 |  |  |  |  |  |
Exercise of warrants (shares) |  |  | 4,222,000 |  |  |  |  |  |  |
Share-based compensation | 1,057 |  |  | 1,057 |  |  |  |  |  |
Ending balance at Mar. 31, 2019 | (32,596) | $ 0 | $ 79 | 558,208 | (5,460) | (585,302) | (121) |  |  |
Ending Balance (shares) at Mar. 31, 2019 |  | 0 | 78,699,000 |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2019 | (37,358) | $ 0 | $ 82 | 584,862 | (3,879) | (618,303) | (120) |  |  |
Beginning Balance (shares) at Dec. 31, 2019 |  | 10,000 | 81,974,000 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net income (loss) | (18,166) |  |  |  |  | (18,198) | 32 |  |  |
Foreign currency translation adjustment | (13,480) |  |  |  | (13,480) |  |  |  |  |
Exercise of stock options and vesting of restricted stock units | 49 |  | $ 0 | 49 |  |  |  |  |  |
Exercise of stock options and vesting of restricted stock units (shares) |  |  | 129,000 |  |  |  |  |  |  |
Taxes withheld on net settled vesting of restricted stock units | (73) |  |  | (73) |  |  |  |  |  |
Issuance of shares |  |  |  |  |  |  |  | $ 27,330 |  | $ 27,330
Issuance of shares (shares) |  |  |  |  |  |  |  |  | 27,000 |
Issuance of common shares in connection with the Notes Exchange | 66,087 |  | $ 14 | 66,073 |  |  |  |  |  |
Issuance of common shares in connection with the Notes Exchange (shares) |  |  | 13,739,000 |  |  |  |  |  |  |
Exercise of warrants | $ 1,861 |  | $ 0 | 1,861 |  |  |  |  |  |
Exercise of warrants (shares) | 338,454 |  | 338,000 |  |  |  |  |  |  |
Share-based compensation | $ 1,553 |  |  | 1,553 |  |  |  |  |  |
Series E preferred stock dividends | 0 |  |  | 392 |  | (392) |  |  |  |
Ending balance at Mar. 31, 2020 | $ 27,803 | $ 0 | $ 96 | $ 682,047 | $ (17,359) | $ (636,893) | $ (88) |  |  |
Ending Balance (shares) at Mar. 31, 2020 |  | 37,000 | 96,180,000 |  |  |  |  |  |  |

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