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Stock-Based Compensation - Common Stock Reserved for Issuance and Shares Available for Future Issuance (Details) - shares
Dec. 31, 2018
Dec. 31, 2017
Jul. 31, 2013
2018 Plan      
Stock-Based Compensation      
Common Stock reserved for issuance (in shares) 2,354    
Maximum aggregate number of shares that may be issued under the plan 402,354    
Common Stock available for future issuance (in shares) 95,264    
2018 Plan | Common Stock      
Stock-Based Compensation      
Maximum aggregate number of shares that may be issued under the plan 400,000    
Stock options      
Stock-Based Compensation      
Common Stock available for future issuance (in shares) 95,264 3,842  
Stock options | 2013 Plan      
Stock-Based Compensation      
Common Stock reserved for issuance (in shares)     40,718
Evergreen provision, percentage of issued and outstanding common stock (as a percent)     4.00%
Evergreen provision, shares (in shares)     13,333