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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, 2012 $ 85,447 $ 34 $ 438,477 $ (25,000) $ (328,078) $ 14 $ 0
Beginning Balance, shares at Dec. 31, 2012   33,655          
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net loss (43,413)       (43,413)    
Other comprehensive loss (9)         (9)  
Exercise of stock options, vesting of restricted stock units and stock issued under ESPP (in shares)   442          
Exercise of stock options, vesting of restricted stock units and stock issued under ESPP 102   102        
Taxes withheld on net settled vesting of restricted stock units (654)   (654)        
Share-based compensation 3,443   3,443        
Ending Balance at Dec. 31, 2013 44,916 $ 34 441,368 (25,000) (371,491) 5 0
Ending Balance, shares at Dec. 31, 2013   34,097          
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net loss (39,229)       (39,229)    
Other comprehensive loss (5)         (5)  
Exercise of stock options, vesting of restricted stock units and stock issued under ESPP (in shares)   689          
Exercise of stock options, vesting of restricted stock units and stock issued under ESPP 248 $ 2 246        
Taxes withheld on net settled vesting of restricted stock units (1,067)   (1,067)        
Issuance of common stock in connection with litigation settlement (in shares)   2,407          
Issuance of common stock in connection with litigation settlement 5,000 $ 2 4,998        
Issuance of common stock in connection with the conversion of convertible securities (in shares)   872          
Issuance of common stock in connection with the conversion of convertible securities 940 $ 1 939        
Issuance of common stock (in shares)   7,363          
Issuance of common stock 7,936 $ 7 7,929        
Beneficial conversion feature of convertible Series C preferred stock 0   445   (445)    
Reclassification of warrant liability 8,219   8,219        
Share-based compensation (in shares)   314          
Share-based compensation 3,588   3,588        
Ending Balance at Dec. 31, 2014 30,546 $ 46 466,665 $ (25,000) (411,165) 0 0
Ending Balance, shares at Dec. 31, 2014   45,742          
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net loss (52,294)       (52,286)   (8)
Other comprehensive loss (8,507)         (8,507)  
Noncontrolling interest acquired in Ctrack acquisition 39           39
Exercise of stock options, vesting of restricted stock units and stock issued under ESPP (in shares)   1,257          
Exercise of stock options, vesting of restricted stock units and stock issued under ESPP 1,764 $ 1 1,763        
Taxes withheld on net settled vesting of restricted stock units (757)   (757)        
Issuance of common stock in connection with the conversion of convertible securities (in shares)   3,825          
Issuance of common stock in connection with the conversion of convertible securities 8,644 $ 4 8,640        
Issuance of common stock (in shares)   2,158          
Issuance of common stock 5,750 $ 2 5,748        
Share-based compensation (in shares)   183          
Share-based compensation 6,350   6,350        
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 at Dec. 31, 2015   53,165