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Consolidated Statement of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($)
$ in Thousands
Total
Term Loan Facility [Member]
IPO [Member]
Follow-on Offering [Member]
Private Placement [Member]
Redeemable Convertible Preferred Stock [Member]
Common Stock [Member]
Common Stock [Member]
IPO [Member]
Common Stock [Member]
Follow-on Offering [Member]
Common Stock [Member]
Private Placement [Member]
Additional Paid-in Capital [Member]
Additional Paid-in Capital [Member]
Term Loan Facility [Member]
Additional Paid-in Capital [Member]
IPO [Member]
Additional Paid-in Capital [Member]
Follow-on Offering [Member]
Additional Paid-in Capital [Member]
Private Placement [Member]
Accumulated Deficit [Member]
Beginning balance at Dec. 31, 2012 $ (80,039)                   $ 1,257         $ (81,296)
Redeemable convertible preferred stock, Beginning balance at Dec. 31, 2012           $ 83,751                    
Beginning balance, shares at Dec. 31, 2012             609,945                  
Redeemable convertible preferred stock, Beginning balance, shares at Dec. 31, 2012           87,037,546                    
Exercise of stock options 35                   35          
Exercise of stock options, shares             8,911                  
Stock-based compensation 622                   622          
Conversion of convertible preferred stock into common stock 2,226         $ (2,226)         2,226          
Conversion of convertible preferred stock into common stock, shares           (1,830,190) 166,675                  
Net loss (17,143)                             (17,143)
Ending balance at Dec. 31, 2013 (94,299)                   4,140         (98,439)
Redeemable convertible preferred stock, Ending balance at Dec. 31, 2013           $ 81,525                    
Ending balance, shares at Dec. 31, 2013             785,531                  
Redeemable convertible preferred stock, Ending balance, shares at Dec. 31, 2013           85,207,356                    
Exercise of stock options 140                   140          
Exercise of stock options, shares             41,566                  
Stock-based compensation 885                   885          
Issuance of Common Stock     $ 59,862         $ 1         $ 59,861      
Issuance of Common Stock, shares               9,569,715                
Conversion of convertible preferred stock into common stock 81,526         $ (81,525) $ 1       81,525          
Conversion of convertible preferred stock into common stock, shares           (85,207,356) 6,826,004                  
Reclassification/Issuance of warrants     $ 424                   $ 424      
Conversion of convertible notes 20,129                   20,129          
Conversion of convertible notes, shares             2,902,233                  
Net loss (23,342)                             (23,342)
Ending balance at Dec. 31, 2014 45,325           $ 2       167,104         (121,781)
Ending balance, shares at Dec. 31, 2014             20,125,049                  
Exercise of stock options $ 1,628                   1,628          
Exercise of stock options, shares 370,230           370,230                  
Stock-based compensation $ 2,375                   2,375          
Issuance of Common Stock       $ 37,185 $ 1,000       $ 1         $ 37,184 $ 1,000  
Issuance of Common Stock, shares                 6,716,000 135,501            
Reclassification/Issuance of warrants   $ 824                   $ 824        
Net loss (39,594)                             (39,594)
Ending balance at Dec. 31, 2015 $ 48,743           $ 3       $ 210,115         $ (161,375)
Ending balance, shares at Dec. 31, 2015             27,346,780