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Share-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity awards outstanding 908,227    
Remaining equity awards available for future issuances 773,067    
Unrecognized employee stock-based compensation costs $ 7.4    
Remaining weighted-average period for RSUs 3 years 2 months 11 days    
Options to purchase Common Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares outstanding (in shares) 2,969,000   2,321,000
Expiration period 10 years    
Weighted average fair value per option (in usd per share) $ 8.32 $ 0.70  
Shares issued in period (in shares) 956,000    
Options to purchase Common Stock | Initial vesting period      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percent 25.00%    
Options to purchase Common Stock | Subsequent vesting period      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percent 75.00%    
Vesting period 36 months    
Options to purchase Common Stock | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 48 months    
Non-employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized stock-based compensation expense for non-employees $ 0.1    
Weighted-average remaining period for recognition of non-employee stock-based compensation expense 11 months 12 days    
Non-employee Stock Option | Non-employees      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares issued in period (in shares) 0 0  
2008 Equity Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares outstanding (in shares) 2,060,993    
2016 Equity Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares authorized for issuance (in shares) 4,182,404    
Basis for equity incentive plan (in shares) 1,681,294    
Common stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares available for issuance under ESPP (in shares) 200,000    
Employee share purchases (in shares) 13,193