Stock Plan - Schedule of Stock Options Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019	Dec. 31, 2018
Shares Available For Grant
Shares Available for Grant, Balance	1,530,523
Shares Available for Grant, Options granted	(1,341,005)
Shares Available for Grant, Options forfeited / cancelled	48,324
Shares Available for Grant, Balance	237,842	1,530,523
Number of Options
Options	2,767,868
Options granted, Number of Options	1,341,005		119,012
Options forfeited / cancelled, Number of Options	(48,324)
Options Outstanding, Number of Options	4,060,549	2,767,868
Vested, Number of Options	2,355,357
Exercisable, Number of Options	2,485,843
Weighted Average Exercise Price
Options Outstanding, Weighted Average Exercise Price	$ 2.05
Options granted, Weighted Average Exercise Price	4.49
Options forfeited / cancelled, Weighted Average Exercise Price	1.89
Options Outstanding, Weighted Average Exercise Price	2.87	$ 2.05
Vested, Weighted Average Exercise Price	1.96
Exercisable, Weighted Average Exercise Price	$ 2.01
Weighted-Average Remaining Contractual Life
Options Outstanding, Weighted-Average Remaining Contractual Life	7 years 4 months 9 days	7 years 29 days
Vested, Weighted-Average Remaining Contractual Life	6 years 2 months 15 days
Exercisable, Weighted-Average Remaining Contractual Life	6 years 3 months 3 days
Aggregate Intrinsic Value
Options Outstanding, Aggregate Intrinsic Value	$ 132,485	$ 5,048
Vested, Aggregate Intrinsic Value	79,005
Exercisable, Aggregate Intrinsic Value	$ 83,248