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Stock Plans and Stock-Based Compensation - Additional Information (Details) - shares
6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Sep. 15, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Shares reserved for issuance 5,118,630    
Stock option granted during period 284,470 292,204  
2016 Equity Incentive Plan      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Shares reserved for issuance     3,893,118
Automatic increase percentage     3.00%
2016 Equity Incentive Plan | Tranche One      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Shares reserved for issuance     2,000,000
2008 Equity Incentive Plan      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock options vesting period 4 years    
Stock options expiration period 10 years    
Stock option granted during period 0    
2008 Equity Incentive Plan | Tranche Two | Maximum      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Shares reserved for issuance     42,934
2008 Equity Incentive Plan | Tranche Three | Maximum      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Shares reserved for issuance     1,850,184