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Share-Based Payments - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Mar. 14, 2017
Jan. 01, 2017
Jun. 30, 2017
2014 ESPP      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee stock purchase plan issued during period (in shares) 2,899    
Purchase price of shares authorized (in USD per share) $ 1.71    
2014 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Increase in number of shares reserved for future issuance (in shares)   982,164  
Shares available for issuance (in shares)     1,989,329
Unrecognized compensation expense     $ 1.8
Total unrecognized compensation cost related to non-vested stock options and unvested restricted stock, recognition period (in years)     2 years 8 months 16 days