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Subsequent Events (Details)
$ / shares in Units, $ in Thousands
 6 Months Ended
Aug. 10, 2016
$ / shares
shares
Aug. 08, 2016
USD ($)
$ / shares
shares
Aug. 04, 2016
USD ($)
person
director
$ / shares
shares
Jun. 30, 2016
USD ($)
shares
Aug. 03, 2016
shares
Dec. 31, 2015
shares
Subsequent Events            
Other offering expenses | $       $ 149    
Common stock, shares authorized       17,674,419   17,674,419
Subsequent Event            
Subsequent Events            
Common stock, shares authorized         100,000,000  
Preferred stock, shares authorized         10,000,000  
Subsequent Event | IPO            
Subsequent Events            
Issuance of stock (in shares)     3,000,000      
Share Price | $ / shares     $ 10.00      
Net proceeds | $     $ 26,000      
Underwriting discounts and commissions | $   $ 2,100 2,100      
Other offering expenses | $   $ 2,200 $ 2,200      
Number of shares sold to 3 officers and 5 board members     154,450      
Number of officers | person     3      
Number of board members | director     5      
Proceeds from issuance of shares to 3 officers and 5 board members | $     $ 1,500      
Number of shares sold to 1 investor related to 1 of the Company’s directors     500,000      
Number of investor related to 1 of the Company’s directors | person     1      
Proceeds from issuance of shares to 1 investor related to 1 of the Company’s directors | $     $ 5,000      
Number of shares sold to 14 investors who are related to 5 officers of the Company     47,000      
Number of investor related to 5 officers of Company | person     14      
Proceeds from issuance of shares to 14 investors who are related to 5 officers of the Company | $     $ 500      
Subsequent Event | Overallotment            
Subsequent Events            
Issuance of stock (in shares)   27,755        
Share Price | $ / shares   $ 10.00        
Subsequent Event | Restricted stock awards | Certain employees            
Subsequent Events            
Accelarated vesting 145,833          
Grant date fair value | $ / shares $ 4,000          
Subsequent Event | Series A Preferred Stock            
Subsequent Events            
Shares converted 827,205          
Subsequent Event | Convertible Notes And Interim Notes            
Subsequent Events            
Shares converted 1,656,807          
Subsequent Event | Employee Stock Option            
Subsequent Events            
Granted 1,825,200          
Vesting period 4 years          
Exercise price | $ / shares $ 10