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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Accumulated Other Comprehensive Income (Loss)
Noncontrolling Interests
Beginning balance at Dec. 31, 2017 $ (45,615) $ 59 $ 519,531 $ (569,759) $ 4,604 $ (50)
Beginning Balance, shares at Dec. 31, 2017   58,645        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net loss (8,060)     (8,050)   (10)
Foreign currency translation adjustment 3,177       3,177  
Exercise of stock options and vesting of restricted stock units (shares)   577        
Exercise of stock options and vesting of restricted stock units 521   521      
Taxes withheld on net settled vesting of restricted stock units (139)   (139)      
Share-based compensation 880   880      
Ending balance at Mar. 31, 2018 (49,236) $ 59 520,793 (577,809) 7,781 (60)
Ending Balance, shares at Mar. 31, 2018   59,222        
Beginning balance at Dec. 31, 2018 (36,525) $ 74 546,230 (577,817) (4,877) (135)
Beginning Balance, shares at Dec. 31, 2018   73,980        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net loss (7,471)     (7,485)   14
Foreign currency translation adjustment (583)       (583)  
Exercise of stock options and vesting of restricted stock units (shares)   497        
Exercise of stock options and vesting of restricted stock units 399 $ 1 398      
Taxes withheld on net settled vesting of restricted stock units (112)   (112)      
Exercise of warrants (in shares)   4,222        
Exercise of warrants 10,639 $ 4 10,635      
Share-based compensation 1,057   1,057      
Ending balance at Mar. 31, 2019 $ (32,596) $ 79 $ 558,208 $ (585,302) $ (5,460) $ (121)
Ending Balance, shares at Mar. 31, 2019   78,699