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Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Balance at Dec. 31, 2013 $ 56,443 $ 21 $ 142,071 $ (85,649)
Balance (in shares) at Dec. 31, 2013   21,143,313    
Increase (Decrease) in Convertible Preferred Stock and Stockholders' Equity (Deficit)        
Issuance of common stock on exercise of stock options 675 $ 1 674  
Issuance of common stock on exercise of stock options (in shares)   402,100    
Issuance of common stock on cashless exercise of warrant (in shares)   13,739    
Common stock subject to repurchase 3   3  
Issuance of common stock for acquisition 10,078 $ 1 10,077  
Issuance of common stock for acquisition (in shares)   964,377    
Stock-based compensation expense (employee) 3,388   3,388  
Stock-based compensation expense (non-employee) 160   160  
Net loss (29,373)     (29,373)
Comprehensive loss (29,373)     (29,373)
Balance at Dec. 31, 2014 41,374 $ 23 156,373 (115,022)
Balance (in shares) at Dec. 31, 2014   22,523,529    
Increase (Decrease) in Convertible Preferred Stock and Stockholders' Equity (Deficit)        
Issuance of common stock on exercise of stock options 722   722  
Issuance of common stock on exercise of stock options (in shares)   253,787    
Issuance of common stock for acquisition 0      
Sale of common stock in a private placement, net of issuance costs 37,258 $ 5 37,253  
Sale of common stock in a private placement, net of issuance costs (in shares)   4,907,975    
Issuance of common stock in a private placement, issuance cost 2,742      
Stock-based compensation expense (employee) 5,302   5,302  
Stock-based compensation expense (non-employee) 110   110  
Stock-based compensation expense (ESPP) 190   190  
Net loss (33,704)     (33,704)
Comprehensive loss (33,704)     (33,704)
Balance at Dec. 31, 2015 51,252 $ 28 199,950 (148,726)
Balance (in shares) at Dec. 31, 2015   27,685,291    
Increase (Decrease) in Convertible Preferred Stock and Stockholders' Equity (Deficit)        
Issuance of common stock on exercise of stock options $ 538   538  
Issuance of common stock on exercise of stock options (in shares) 212,740 212,740    
Issuance of common stock under employee stock purchase plan (ESPP) $ 678   678  
Issuance of common stock on employee stock purchase plan (ESPP) (in shares)   140,947    
Issuance of common stock for acquisition 0      
Sale of common stock in a private placement, net of issuance costs 32,093 $ 6 32,087  
Sale of common stock in a private placement, net of issuance costs (in shares)   5,723,300    
Issuance of common stock in a private placement, issuance cost 2,247      
Stock-based compensation expense (employee) 6,046   6,046  
Stock-based compensation expense (non-employee) 15   15  
Stock-based compensation expense (ESPP) 317   317  
Net loss (31,358)     (31,358)
Comprehensive loss (31,358)     (31,358)
Balance at Dec. 31, 2016 $ 59,581 $ 34 $ 239,631 $ (180,084)
Balance (in shares) at Dec. 31, 2016   33,762,278.000