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Organization and Operations (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Aug. 27, 2014
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2010
Proceeds from Issuance Initial Public Offering     $ 61,744      
Preferred Stock warrants converted (in shares) 24,566          
Number of shares after conversion of issued warrants (in shares)   24,566       34,839
Accumulated deficit     $ (108,010)   $ (75,380)  
Issuance of preferred stock (in shares)     0   0  
Proceeds from issuance of preferred stock     $ 12,331 $ 41,422    
Series B Convertible Preferred Stock            
Preferred Stock warrants converted (in shares)     47,192,536      
Initial public offering            
Common stock sold (in shares)   5,750,000        
Selling price (in dollars per share)   $ 12.00        
Net proceeds from public offering   $ 61,700        
Underwriting discounts, commissions and offering-related expenses payable   $ 7,300        
Conversion of convertible preferred stock into common stock (in shares)   9,029,549        
Over-Allotment option for underwriters            
Common stock sold (in shares)   750,000        
Preferred Stock | Initial public offering            
Preferred Stock warrants converted (in shares)   315,688