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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, 2016 $ (17,727) $ 54 $ 507,616 $ (524,024) $ (1,409) $ 36
Beginning Balance, shares (in shares) at Dec. 31, 2016   54,372        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net loss (45,840)     (45,735)   (105)
Foreign currency translation adjustment 6,013       6,013  
Noncontrolling interest acquired 19         19
Exercise of stock options, vesting of restricted stock units and stock issued under employee stock purchase plan 390 $ 2 388      
Exercise of stock options, vesting of restricted stock units and stock issued under ESPP (in shares)   1,231        
Taxes withheld on net settled vesting of restricted stock units (896)   (896)      
Issuance of common stock 5,078 $ 3 5,075      
Issuance of common stock (in shares)   3,042        
Share-based compensation 3,748   3,748      
Share-based compensation (in shares)   0        
Additional discount on exchange of convertible senior notes 3,600   3,600      
Ending Balance at Dec. 31, 2017 (45,615) $ 59 519,531 (569,759) 4,604 (50)
Ending Balance, shares (in shares) at Dec. 31, 2017   58,645        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net loss (8,143)     (8,058)   (85)
Foreign currency translation adjustment (9,481)       (9,481)  
Exercise of stock options, vesting of restricted stock units and stock issued under employee stock purchase plan 2,408 $ 3 2,405      
Exercise of stock options, vesting of restricted stock units and stock issued under ESPP (in shares)   2,645        
Taxes withheld on net settled vesting of restricted stock units (656)   (656)      
Issuance of common stock 20,086 $ 12 20,074      
Issuance of common stock (in shares)   12,690        
Share-based compensation 4,876   4,876      
Share-based compensation (in shares)   0        
Ending Balance at Dec. 31, 2018 $ (36,525) $ 74 $ 546,230 $ (577,817) $ (4,877) $ (135)
Ending Balance, shares (in shares) at Dec. 31, 2018   73,980