Stockholders' Equity - Schedule of Stock Options, Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Weighted Average Exercise Price, Outstanding, Beginning Balance	$ 1.85
Weighted Average Exercise Price, Outstanding, Ending Balance	$ 2.05	$ 1.85
Employee Stock Option Awards [Member]
Number of Shares, Outstanding, Beginning Balance	5,669,000	1,575,000
Number of Shares, Options granted	7,610,000	4,150,000
Number of Shares, Options Exercised	(100,000)	(6,000)
Number of Shares, Options Expired	(250,000)
Number of shares, Options Forfeited	(300,000)	(50,000)
Number of Shares, Outstanding, Ending Balance	12,629,000	5,669,000
Number of Shares, Options vested and expected to vest	12,629,000
Number of Shares, Options vested and exercisable	3,654,000
Weighted Average Exercise Price, Outstanding, Beginning Balance	$ 1.48	$ 0.50
Weighted Average Exercise Price, Options granted	2.06	1.85
Weighted Average Exercise Price, Options Exercised	0.20	1.08
Weighted Average Exercise Price, Options Expired	0.10
Weighted Average Exercise Price, Options Forfeited	1.25	1.85
Weighted Average Exercise Price, Outstanding, Ending Balance	1.87	$ 1.48
Weighted Average Exercise Price, Options vested and expected to vest	1.87
Weighted Average Exercise Price, Options vested and exercisable	$ 1.50
Intrinsic Value, Outstanding, Beginning Balance	$ 7,793	$ 1,264
Intrinsic Value, Options Granted		4,160
Intrinsic Value, Options Exercised	152	11
Intrinsic Value, Options Expired	443
Intrinsic Value, Options Forfeited		6
Intrinsic Value, Outstanding, Ending Balance	357	$ 7,793
Intrinsic Value, Options vested and expected to vest	357
Intrinsic Value, Options vested and exercisable	$ 357
Weighted Average Remaining Contractual Life (in years), Outstanding, Beginning Balance	4 years 3 months 19 days	4 years 8 months 12 days
Weighted Average Remaining Contractual Life (in years), Options granted	6 years 3 months 19 days	4 years 6 months
Weighted Average Remaining Contractual Life (in years), Options Exercised	0 years	0 years
Weighted Average Remaining Contractual Life (in years), Options Expired	0 years	0 years
Weighted Average Remaining Contractual Life (in years), Outstanding, Ending Balance	5 years 2 months 12 days	4 years 3 months 19 days
Weighted Average Remaining Contractual Life (in years), Options vested and expected to vest	5 years 2 months 12 days
Weighted Average Remaining Contractual Life (in years), Options vested and exercisable	3 years 7 months 6 days
Non-Employee Stock Option Awards [Member]
Number of Shares, Outstanding, Beginning Balance	3,205,000	2,955,000
Number of Shares, Options granted	200,000	250,000
Number of Shares, Options Exercised	(10,000)
Number of Shares, Options Expired	(300,000)
Number of Shares, Outstanding, Ending Balance	3,095,000	3,205,000
Number of Shares, Options vested and expected to vest	3,095,000
Number of Shares, Options vested and exercisable	2,645,000
Weighted Average Exercise Price, Outstanding, Beginning Balance	$ 0.40	$ 0.27
Weighted Average Exercise Price, Options granted	1.64	1.95
Weighted Average Exercise Price, Options Exercised	0.20
Weighted Average Exercise Price, Options Expired	0.15
Weighted Average Exercise Price, Outstanding, Ending Balance	0.51	$ 0.40
Weighted Average Exercise Price, Options vested and expected to vest	0.51
Weighted Average Exercise Price, Options vested and exercisable	$ 0.51
Intrinsic Value, Outstanding, Beginning Balance	$ 7,847	$ 3,053
Intrinsic Value, Options Granted		225
Intrinsic Value, Options Exercised	22
Intrinsic Value, Options Expired	491
Intrinsic Value, Outstanding, Ending Balance	1,567	$ 7,847
Intrinsic Value, Options vested and expected to vest	1,567
Intrinsic Value, Options vested and exercisable	$ 1,339
Weighted Average Remaining Contractual Life (in years), Outstanding, Beginning Balance	2 years 4 months 24 days	3 years 2 months 12 days
Weighted Average Remaining Contractual Life (in years), Options granted	3 years 8 months 12 days	4 years 7 months 6 days
Weighted Average Remaining Contractual Life (in years), Options Exercised	0 years	0 years
Weighted Average Remaining Contractual Life (in years), Options Expired	0 years	0 years
Weighted Average Remaining Contractual Life (in years), Outstanding, Ending Balance	1 year 8 months 12 days	2 years 4 months 24 days
Weighted Average Remaining Contractual Life (in years), Options vested and expected to vest	1 year 8 months 12 days
Weighted Average Remaining Contractual Life (in years), Options vested and exercisable	1 year 8 months 12 days