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Preferred Stock (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Jun. 30, 2015
shares
Mar. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2017
series
$ / shares
shares
Dec. 31, 2015
USD ($)
Dec. 31, 2016
$ / shares
shares
Preferred Stock          
Preferred stock, authorized (in Shares)     5,000,000   5,000,000
Preferred stock, par value (in dollars per share) | $ / shares     $ 0.001   $ 0.001
Preferred Stock, shares issued (in shares)     0   0
Share price (in dollars per share) | $ / shares     $ 0.001    
Preferred stock, outstanding (in shares)     0   0
Minimum number of series used to issue preferred stock | series     1    
Net proceeds from issuance of preferred stock | $       $ 12,331  
Initial public offering          
Preferred Stock          
Conversion of convertible preferred stock into common stock (in shares) 9,029,549        
Series B Convertible Preferred Stock          
Preferred Stock          
Preferred Stock, shares issued (in shares)   13,062,965      
Share price (in dollars per share) | $ / shares   $ 0.9503      
Net proceeds from issuance of preferred stock | $   $ 12,300