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Share-Based Payments - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 14, 2018
Jan. 01, 2018
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation expense     $ 1.0
2014 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Increase in number of shares reserved for future issuance (in shares)   1,388,103  
Shares available for issuance (in shares)     2,594,634
2014 ESPP      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation expected to be recognized over a weighted-average period (in years)     2 years 4 months 24 days
Employee stock purchase plan issued during period (in shares) 9,565    
Purchase price of shares authorized (in USD per share) $ 0.98