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Stock-Based Compensation (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Dec. 31, 2018
Stock-based compensation      
Fair value assumptions method used   Black-Scholes option-pricing model  
Stock Options [Member]      
Stock-based compensation      
Options granted (in shares)   1,550,270  
Resulting weighted average grant date fair value     $ 1.25
Stock Options [Member] | Minimum [Member]      
Stock-based compensation      
Resulting weighted average grant date fair value   $ 0.52  
Stock Options [Member] | Maximum [Member]      
Stock-based compensation      
Resulting weighted average grant date fair value   $ 0.61  
2015 Plan [Member] | Performance Share Options [Member]      
Stock-based compensation      
Stock awards expected to vest 39,713 39,713  
Catch up adjustment related to the change in estimate $ 91,000    
2018 Equity Incentive Plan (the "2018 Plan")      
Stock-based compensation      
Number of authorized additional shares to be issued   709,889  
2018 Equity Incentive Plan (the "2018 Plan") | Minimum [Member]      
Stock-based compensation      
Life of stock option awards granted   1 year  
2018 Equity Incentive Plan (the "2018 Plan") | Maximum [Member]      
Stock-based compensation      
Number of authorized shares 1,500,000 1,500,000  
Life of stock option awards granted   4 years  
2018 Equity Incentive Plan (the "2018 Plan") | Stock Options [Member]      
Stock-based compensation      
Number of shares reserved for issuance 228,334 228,334  
Life of stock option awards granted   10 years  
Options granted (in shares)   1,550,270 306,304
2018 Equity Incentive Plan (the "2018 Plan") | Stock Options [Member] | Minimum [Member]      
Stock-based compensation      
Vesting period   1 year  
Resulting weighted average grant date fair value   $ 0.52 $ 1.17
2018 Equity Incentive Plan (the "2018 Plan") | Stock Options [Member] | Maximum [Member]      
Stock-based compensation      
Vesting period   4 years  
Resulting weighted average grant date fair value   $ 0.61 $ 1.29
2018 Equity Incentive Plan (the "2018 Plan") | Performance Share Options [Member]      
Stock-based compensation      
Options granted (in shares)     174,272
Stock awards vested     36,537
Stock awards expected to vest 36,537 36,537