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Stock Options - Other (Details) - shares
1 Months Ended 9 Months Ended
Jul. 31, 2018
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Stock Options.        
Stock Options        
Vesting period   4 years    
Contractual life   P10Y    
2018 Plan        
Stock Options        
Shares reserved for issuance 1,600,000 2,217,735 2,220,778 1,600,000
Reserve increase, percentage of number of shares of common stock issued and outstanding 4.00%