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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Preferred Stock
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Accumulated Other Comprehensive Income (Loss)
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, 2017 $ (45,615) $ 0 $ 59 $ 519,531 $ (569,759) $ 4,604 $ (50)      
Beginning Balance, shares at Dec. 31, 2017   0 58,645              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income (loss) (3,902)       (3,867)   (35)      
Foreign currency translation adjustment (8,589)         (8,589)        
Exercise of stock options and vesting of restricted stock units (shares)     2,056              
Exercise of stock options, vesting of restricted stock units and shares issued under employee stock purchase plan 1,672   $ 2 1,670            
Taxes withheld on net settled vesting of restricted stock units (650)     (650)            
Issuance of shares (in shares)     12,690              
Issuance of shares 20,086   $ 12 20,074            
Share-based compensation 3,678     3,678            
Ending balance at Sep. 30, 2018 (33,320) $ 0 $ 73 544,303 (573,626) (3,985) (85)      
Ending Balance, shares at Sep. 30, 2018   0 73,391              
Beginning balance at Jun. 30, 2018 (64,643) $ 0 $ 60 522,033 (584,469) (2,188) (79)      
Beginning Balance, shares at Jun. 30, 2018   0 59,743              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income (loss) 10,837       10,843   (6)      
Foreign currency translation adjustment (1,797)         (1,797)        
Exercise of stock options and vesting of restricted stock units (shares)     958              
Exercise of stock options, vesting of restricted stock units and shares issued under employee stock purchase plan 800   $ 1 799            
Taxes withheld on net settled vesting of restricted stock units (337)     (337)            
Issuance of shares (in shares)     12,690              
Issuance of shares 20,086   $ 12 20,074            
Share-based compensation 1,734     1,734            
Ending balance at Sep. 30, 2018 (33,320) $ 0 $ 73 544,303 (573,626) (3,985) (85)      
Ending Balance, shares at Sep. 30, 2018   0 73,391              
Beginning balance at Dec. 31, 2018 (36,525) $ 0 $ 74 546,230 (577,817) (4,877) (135)      
Beginning Balance, shares at Dec. 31, 2018   0 73,980              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income (loss) (27,013)       (27,070)   57      
Foreign currency translation adjustment (2,912)         (2,912)        
Exercise of stock options and vesting of restricted stock units (shares)     1,382              
Exercise of stock options, vesting of restricted stock units and shares issued under employee stock purchase plan 1,517   $ 1 1,516            
Taxes withheld on net settled vesting of restricted stock units (1,260)     (1,260)            
Issuance of shares (in shares)     242           10  
Issuance of shares 1,279   $ 1 1,278       $ 10,000   $ 10,000
Exercise of warrants (in shares)     4,222              
Exercise of warrants 10,639   $ 4 10,635            
Share-based compensation 5,955     5,955            
Series E preferred stock dividends 0     131 (131)          
Ending balance at Sep. 30, 2019 (38,320) $ 0 $ 80 574,485 (605,018) (7,789) (78)      
Ending Balance, shares at Sep. 30, 2019   10 79,826              
Beginning balance at Jun. 30, 2019 (37,328) $ 0 $ 79 562,405 (596,081) (3,670) (61)      
Beginning Balance, shares at Jun. 30, 2019   0 78,985              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income (loss) (8,823)       (8,806)   (17)      
Foreign currency translation adjustment (4,119)         (4,119)        
Exercise of stock options and vesting of restricted stock units (shares)     645              
Exercise of stock options, vesting of restricted stock units and shares issued under employee stock purchase plan 601     601            
Taxes withheld on net settled vesting of restricted stock units (942)     (942)            
Issuance of shares (in shares)     196           10  
Issuance of shares 1,038   $ 1 1,037       $ 10,000   $ 10,000
Share-based compensation 1,253     1,253            
Series E preferred stock dividends 0     131 (131)          
Ending balance at Sep. 30, 2019 $ (38,320) $ 0 $ 80 $ 574,485 $ (605,018) $ (7,789) $ (78)      
Ending Balance, shares at Sep. 30, 2019   10 79,826