Commitments and Contingencies - Settlement of Underwriter Fee (Details) - USD ($)	1 Months Ended			3 Months Ended	12 Months Ended
	Apr. 30, 2020	Sep. 30, 2019	Aug. 31, 2018	Mar. 31, 2020	Dec. 31, 2019
Number of pre-funded warrants issued					20,637,761
Convertible warrants				9,580
Underwriter
Number of pre-funded warrants issued			1,096
Payments of underwriters settlement fee		$ 201,650		$ 386,560
Underwriters settlement fee	$ 184,910
Convertible warrants	100,780
Exercise price (in dollars per share)	$ 2.50
Issuance of common stock (In shares)	100,000