Subsequent Events - Additional Information (Details) - USD ($)			2 Months Ended	3 Months Ended	12 Months Ended
	Feb. 26, 2020	Feb. 25, 2020	Mar. 15, 2020	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Mar. 26, 2018
Subsequent Event [Line Items]
Issuance of common stock, shares				5,733,314
Gross proceeds from issuance of common stock				$ 21,100,000
Net proceeds from issuance of common stock				$ 20,200,000
Common stock, shares outstanding					58,090,233	28,585,449
Unrestricted cash and cash equivalents					$ 18,000,000
MidCap Credit Facility
Subsequent Event [Line Items]
Debt Instrument, Frequency of Periodic Payment					25 equal monthly installments
Debt instrument frequency of periodic payment if revenue milestone achieved					21 equal monthly installments
Unrestricted cash and cash equivalents							$ 18,000,000
Common Stock
Subsequent Event [Line Items]
Issuance of common stock, shares				300,000
Gross proceeds from issuance of common stock				$ 600,000
2019 ATM Offering | Common Stock
Subsequent Event [Line Items]
Deferred offering costs					$ 100,000
Subsequent Event | MidCap Credit Facility
Subsequent Event [Line Items]
Debt instrument interest only payment period	11 months
Debt instrument interest only payment period if revenue milestone achieved	4 months
Repayment of convertible note by previously deposited escrowed funds	$ 3,300,000
Unrestricted cash and cash equivalents	$ 18,000,000
Subsequent Event | Exchange Agreement
Subsequent Event [Line Items]
Common stock, shares outstanding		4,110,000
Conversion of convertible preferred stock into common stock		100
Subsequent Event | Series A Convertible Preferred Stock | Exchange Agreement
Subsequent Event [Line Items]
Issuance of common stock, shares		10,170
Preferred stock, shares issued		41,100
Preferred stock, par value		$ 0.001
Issuance of common stock		$ 600,030
Stock issued, price per share		$ 59.00
Subsequent Event | 2019 ATM Offering
Subsequent Event [Line Items]
Gross proceeds from issuance of common stock			$ 2,600,000
Net proceeds from issuance of common stock			$ 2.5
Subsequent Event | 2019 ATM Offering | Common Stock
Subsequent Event [Line Items]
Issuance of common stock, shares			4,399,062