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Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity - USD ($)
$ in Thousands
Total
Series A Convertible Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Restricted Stock [Member]
Ending Balance at Dec. 31, 2015   $ 0        
Beginning Balance at Dec. 31, 2014 $ 54,206   $ 127 $ 187,620 $ (133,541)  
Beginning Balance, Shares at Dec. 31, 2014     12,746,519     8,493
Issuance of common stock from overallotment, net of underwriting fees and issuance costs of $377 4,738   $ 5 4,733    
Issuance of common stock from overallotment, net of underwriting fees and issuance costs of $377, Shares     465,000      
Issuance of warrant as part of the consideration for the consulting related to financial support services in March 2015 11     11    
Vesting of restricted stock 0   $ 0 0 0 $ 0
Vesting of restricted stock, Shares     3,303     (3,303)
Stock-based compensation expense 1,228     1,228    
Exercise of common stock options 39     39    
Exercise of common stock options, Shares     53,458      
Net loss (32,024)       (32,024)  
Ending Balance at Dec. 31, 2015 28,198   $ 132 193,631 (165,565)  
Ending Balance, Shares at Dec. 31, 2015     13,268,280     5,190
Issuance of common stock related to private placement 26   $ 26      
Issuance of common stock related to private placement, Shares     2,596,059      
Issuance of Series A convertible preferred stock 0 $ 0 $ 0 0 0 $ 0
Issuance of Series A convertible preferred stock, Shares   24,159        
Conversion of Series A convertible preferred stock 0 $ 0 $ 0 0 0 0
Conversion of Series A convertible preferred stock, Shares   (10,743) 4,774,398      
Ending Balance at Dec. 31, 2016   $ 0        
Ending Balance, Shares at Dec. 31, 2016   13,416        
Vesting of restricted stock 0   $ 0 0 0 $ 0
Vesting of restricted stock, Shares     3,301     (3,301)
Stock-based compensation expense 1,548     1,548    
Exercise of common stock options $ 3   $ 1 2    
Exercise of common stock options, Shares 3,685   3,685      
Net loss $ (16,208)       (16,208)  
Ending Balance at Dec. 31, 2016 $ 13,567   $ 159 $ 195,181 $ (181,773)  
Ending Balance, Shares at Dec. 31, 2016     20,645,723     1,889