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Subsequent Events - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions			1 Months Ended	3 Months Ended
	May 05, 2020	May 01, 2020	May 14, 2020	Mar. 31, 2020	Dec. 31, 2019
Subsequent Event [Member] | Series E and E1 Preferred Stock [Member]
Subsequent Event [Line Items]
Conversion price	$ 10.00
Maximum [Member]
Subsequent Event [Line Items]
Warrant exercise price				$ 23.04	$ 23.04
Maximum [Member] | Series F warrants [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Warrants issued to purchase of common stock	2,200,000
Minimum [Member]
Subsequent Event [Line Items]
Warrant exercise price				$ 7.00	$ 7.00
Common Stock [Member]
Subsequent Event [Line Items]
Convertible preferred stock, shares upon conversion				2,915
Common Stock [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Gross proceeds from public offering	$ 22.0
Common Stock [Member] | Subsequent Event [Member] | Series E and E1 Preferred Stock [Member]
Subsequent Event [Line Items]
Convertible preferred stock, shares upon conversion			800,000
Common Stock [Member] | IPO | Subsequent Event [Member]
Subsequent Event [Line Items]
Shares issued in public offering	2,200,000
2019 Warrants [Member]
Subsequent Event [Line Items]
Warrant exercise price				$ 23.04
2019 Warrants [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Gross proceeds from public offering		$ 22.0
Warrant exercise price	$ 10.00	$ 10.00

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