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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-in Capital
Treasury Stock
Accumulated Deficit
Accumulated Other Comprehensive Income (Loss)
Noncontrolling Interests
Beginning Balance at Dec. 31, 2014 $ 30,546 $ 46 $ 466,665 $ (25,000) $ (411,165) $ 0 $ 0
Beginning Balance, shares (in shares) at Dec. 31, 2014   45,742          
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net loss (52,294)       (52,286)   (8)
Foreign currency translation adjustment (8,507)         (8,507)  
Noncontrolling interest acquired 39           39
Exercise of stock options, vesting of restricted stock units and stock issued under employee stock purchase plan 1,764 $ 1 1,763        
Exercise of stock options, vesting of restricted stock units and stock issued under ESPP (in shares)   1,257          
Taxes withheld on net settled vesting of restricted stock units (757)   (757)        
Issuance of common stock in connection with the conversion of convertible securities 8,644 $ 4 8,640        
Issuance of common stock in connection with the conversion of convertible securities (in shares)   3,825          
Issuance of common stock 5,750 $ 2 5,748        
Issuance of common stock (in shares)   2,158          
Share-based compensation 6,350   6,350        
Share-based compensation (in shares)   183          
Discount on convertible senior notes 38,305   38,305        
Fair value of DigiCore replacement options granted 623   623        
Retirement of treasury stock 0   (25,000) 25,000      
Ending Balance at Dec. 31, 2015 30,463 $ 53 502,337 0 (463,451) (8,507) 31
Ending Balance, shares (in shares) at Dec. 31, 2015   53,165          
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net loss (60,568)       (60,573)   5
Foreign currency translation adjustment 7,098         7,098  
Exercise of stock options, vesting of restricted stock units and stock issued under employee stock purchase plan 943 $ 1 942        
Exercise of stock options, vesting of restricted stock units and stock issued under ESPP (in shares)   1,207          
Taxes withheld on net settled vesting of restricted stock units (251)   (251)        
Share-based compensation 4,588   4,588        
Share-based compensation (in shares)   0          
Ending Balance at Dec. 31, 2016 (17,727) $ 54 507,616 0 (524,024) (1,409) 36
Ending 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          
Discount on convertible senior notes 3,600   3,600        
Ending Balance at Dec. 31, 2017 $ (45,615) $ 59 $ 519,531 $ 0 $ (569,759) $ 4,604 $ (50)
Ending Balance, shares (in shares) at Dec. 31, 2017   58,645