Stockholders' Equity - Schedule of Stock Option Activity (Details) - USD ($)	1 Months Ended	12 Months Ended
	Jul. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Number of options, granted	98,098
Weighted average exercise price, granted	$ 0.31
Employees [Member]
Number of options outstanding, beginning of year		1,203,918	836,256
Number of options, granted		4,164,585	584,794
Number of options, forfeited		(257,917)	(217,132)
Number of options outstanding, end of year		5,110,586	1,203,918
Number of options, vested and expected to vest		5,110,586
Number of options exercisable, end of year		1,804,927
Weighted average exercise price outstanding, beginning of year		$ 5.91	$ 16.82
Weighted average exercise price, granted		0.32	0.50
Weighted average exercise price, forfeited		18.01	33.35
Weighted average exercise price outstanding, end of year		0.75	$ 5.91
Weighted average exercise price, vested and expected to vest		0.75
Weighted average exercise price outstanding, end of year		$ 1.04
Weighted average remaining contracted term (years) outstanding, beginning of year		6 years 10 months 21 days	4 years 5 months 20 days
Weighted average remaining contracted term (years) outstanding, end of year		9 years 4 days	6 years 10 months 21 days
Weighted average remaining contracted term (years), vested and expected to vest		9 years 4 days
Weighted average remaining contracted term (years), exercisable at end of year		8 years 1 month 2 days
Aggregate intrinsic value outstanding, beginning of year
Aggregate intrinsic value, granted
Aggregate intrinsic value, forfeited
Aggregate intrinsic value outstanding, end of year
Aggregate intrinsic value, vested and expected to vest
Aggregate intrinsic value, exercisable at end of year
Non-Employees [Member]
Number of options outstanding, beginning of year		834,876	271,500
Number of options, granted		1,699,920	605,772
Number of options, exercised
Number of options, forfeited		(109,104)	(42,396)
Number of options outstanding, end of year		2,425,692	834,876
Number of options, vested and expected to vest		2,425,692
Number of options exercisable, end of year		874,164
Weighted average exercise price outstanding, beginning of year		$ 2.70	$ 10.41
Weighted average exercise price, granted		0.31	0.42
Weighted average exercise price, exercised
Weighted average exercise price, forfeited		10.33	19.41
Weighted average exercise price outstanding, end of year		0.68	$ 2.70
Weighted average exercise price, vested and expected to vest		0.68
Weighted average exercise price outstanding, end of year		$ 1.52
Weighted average remaining contracted term (years) outstanding, beginning of year		6 years 8 months 9 days	4 years 7 months 28 days
Weighted average remaining contracted term (years) outstanding, end of year		8 years 6 months 18 days	6 years 8 months 9 days
Weighted average remaining contracted term (years), vested and expected to vest		8 years 6 months 18 days
Weighted average remaining contracted term (years), exercisable at end of year		7 years 9 months 11 days
Aggregate intrinsic value outstanding, beginning of year
Aggregate intrinsic value, granted
Aggregate intrinsic value, exercised
Aggregate intrinsic value, forfeited
Aggregate intrinsic value outstanding, end of year
Aggregate intrinsic value, vested and expected to vest
Aggregate intrinsic value, exercisable at end of year