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Stock Option Plan - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Jul. 31, 2019
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock options, unrecognized compensation cost $ 6,400,000   $ 6,400,000      
Stock options, cost not yet recognized, remaining weighted average vesting period     3 years 6 months      
Stock-based compensation expense $ 62,000 $ 10,000 $ 85,000 $ 100,000    
Employee Stock Purchase Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares reserved for issuance under Stock Option Plan 120,000   120,000      
Annual percentage increase in shares available for issuance under the Plan 100.00%   100.00%      
Maximum Employee payroll deduction percentage 2000.00%   2000.00%      
Stock-based compensation expense $ 0   $ 0      
Stock options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock options, expiration period     10 years      
Stock options, vesting period     4 years      
2013 Stock Option Plan | Stock options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares reserved for issuance under Stock Option Plan         1,663,681 669,806
2019 Incentive Award Plan | Stock options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares reserved for issuance under Stock Option Plan 2,011,832   2,011,832      
Annual percentage increase in shares available for issuance under the Plan 400.00%   400.00%      
Shares that remain available for future awards 1,199,631   1,199,631