Stock-based Compensation (Summary Of RSU Vested And Expected To Vest) (Details) - RSUs [Member] - shares	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSU granted	112,144
Number of RSUs outstanding	225,890	215,084
Equity Incentive Plan 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSU granted	384,435
Number of RSUs outstanding	225,890
Total RSUs Outstanding	225,890
Equity Incentive Plan 2014 [Member] | December 31, 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total RSUs Outstanding	94,126
Equity Incentive Plan 2014 [Member] | December 31, 2020 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total RSUs Outstanding	55,414
Equity Incentive Plan 2014 [Member] | December 31, 2021[Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total RSUs Outstanding	37,632
Equity Incentive Plan 2014 [Member] | December 31, 2022 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total RSUs Outstanding	36,718
Equity Incentive Plan 2014 [Member] | December 31, 2023 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSUs outstanding	1,000
Equity Incentive Plan 2014 [Member] | December 31, 2024 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSUs outstanding	1,000
Equity Incentive Plan 2014 [Member] | 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSU granted	107,274
Number of RSUs outstanding	3,000
Total RSUs Outstanding	3,000
Equity Incentive Plan 2014 [Member] | 2016 [Member] | December 31, 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total RSUs Outstanding	3,000
Equity Incentive Plan 2014 [Member] | 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSU granted	94,329
Number of RSUs outstanding	66,408
Total RSUs Outstanding	66,408
Equity Incentive Plan 2014 [Member] | 2017 [Member] | December 31, 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total RSUs Outstanding	53,232
Equity Incentive Plan 2014 [Member] | 2017 [Member] | December 31, 2020 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total RSUs Outstanding	9,926
Equity Incentive Plan 2014 [Member] | 2017 [Member] | December 31, 2021[Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total RSUs Outstanding	3,250
Equity Incentive Plan 2014 [Member] | 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSU granted	70,688
Number of RSUs outstanding	44,338
Total RSUs Outstanding	44,338
Equity Incentive Plan 2014 [Member] | 2018 [Member] | December 31, 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total RSUs Outstanding	14,359
Equity Incentive Plan 2014 [Member] | 2018 [Member] | December 31, 2020 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total RSUs Outstanding	8,782
Equity Incentive Plan 2014 [Member] | 2018 [Member] | December 31, 2021[Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total RSUs Outstanding	21,197
Equity Incentive Plan 2014 [Member] | 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSU granted	112,144
Number of RSUs outstanding	112,144
Total RSUs Outstanding	112,144
Equity Incentive Plan 2014 [Member] | 2019 [Member] | December 31, 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total RSUs Outstanding	23,535
Equity Incentive Plan 2014 [Member] | 2019 [Member] | December 31, 2020 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total RSUs Outstanding	36,706
Equity Incentive Plan 2014 [Member] | 2019 [Member] | December 31, 2021[Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total RSUs Outstanding	13,185
Equity Incentive Plan 2014 [Member] | 2019 [Member] | December 31, 2022 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total RSUs Outstanding	36,718
Equity Incentive Plan 2014 [Member] | 2019 [Member] | December 31, 2023 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSUs outstanding	1,000
Equity Incentive Plan 2014 [Member] | 2019 [Member] | December 31, 2024 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSUs outstanding	1,000