Subsequent Events - (Details) - USD ($)	1 Months Ended	9 Months Ended
	Oct. 31, 2019	Sep. 30, 2019	Sep. 30, 2018	Jul. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Subsequent Event [Line Items]
Warrants, Exercise price		$ 0.51				$ 0.51
Exercise warrants of common stock during the period		875,000
Net Proceeds from warrants exercised		$ 350,000	$ 2,969,119
Warrant Exercise Agreement
Subsequent Event [Line Items]
Warrants, Exercise price	$ 0.215
Exercise warrants of common stock during the period	16,391,667
Gross Proceeds from warrants exercised	$ 3.5
Warrants investment banker fees (as percentage)	7.00%
Warrant expenses	$ 287,000
Net Proceeds from warrants exercised	$ 3,200,000
Warrant Exercise Agreement | 2017 public offering
Subsequent Event [Line Items]
Warrants, Exercise price	$ 0.76
Warrant Exercise Agreement | 2018 public offerings
Subsequent Event [Line Items]
Warrants, Exercise price	$ 0.40
CRO
Subsequent Event [Line Items]
Contractual deposit Commitment		861,000
Increase in contract amount		$ 3,500,000
Contract amount					$ 6,200,000
Laboratory contract
Subsequent Event [Line Items]
Contract amount				$ 150,000
Subsequent Event | CRO
Subsequent Event [Line Items]
Contractual deposit Commitment	$ 1,200,000
Subsequent Event | Laboratory contract
Subsequent Event [Line Items]
Increase in contract amount	40,000
Contract amount	118,000
Subsequent Event | Licensing agreement for pain scales
Subsequent Event [Line Items]
Contract amount	$ 158,000