Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - 2014 Equity Incentive Plan (Details)

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Stock-based Compensation - 2014 Equity Incentive Plan (Details) - 2014 Equity Incentive Plan - shares
9 Months Ended 12 Months Ended
May 02, 2014
Sep. 30, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of additional awards expected to be granted (in shares) 0    
Expiration period of options   10 years  
Common stock outstanding percentage 4.00%    
Number of shares of common stock for future issuance, board of directors prerogative, increase in period (in shares) 0    
Share-based compensation arrangement by share-based payment award, number of additional shares authorized   1,158,866 984,376
Possible future issuance under equity compensation plan (in shares)   559,373  
Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period of options   3 years  
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period of options   4 years  
Base number of new shares available for future issuance under equity incentive plan (in shares) 1,122,731    
Common stock issuable period 10 years