Stockholders' Equity - Schedule of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Shares
Stock options outstanding at December 31, 2019	3,063,636
Granted	2,567,000
Forfeited/Expired	(38,200)
Stock options outstanding at June 30, 2020	5,592,436
Stock options exercisable at June 30, 2020	2,357,128
Weighted Average Exercise Price
Stock options outstanding at December 31, 2019	$ 2.56
Granted	0.58
Forfeited/Expired	2.20
Stock options outstanding at June 30, 2020	1.65
Stock options exercisable at June 30, 2020	$ 2.83
Weighted Average Remaining Contractual Life
Stock options outstanding at June 30, 2020	8 years 10 months 24 days
Stock options exercisable at June 30, 2020	8 years 2 months 12 days
Unrecognized stock-based compensation expense	$ 2.1
Unrecognized stock-based compensation expense, recognition period	1 year 8 months 12 days
Weighted-average fair value of options	$ 0.42	$ 0.80