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Stockholders' Equity - Additional Information (Detail) - USD ($)		12 Months Ended
	Apr. 30, 2020	Dec. 31, 2019	Dec. 31, 2018	Aug. 21, 2017
Class Of Stock [Line Items]
Proceeds from issuance of common stock		$ 9,676,000	$ 7,491,000
Warrants available for exercise		7,070,680	0
2019 Equity Offering [Member]
Class Of Stock [Line Items]
Common stock shares agreed to sell	3,449,112
Common stock shares agreed to sell, gross proceeds value	$ 10,700,000
Series A Warrants [Member]
Class Of Stock [Line Items]
Warrants available for exercise		3,449,112	0
Series B Warrants [Member]
Class Of Stock [Line Items]
Warrants available for exercise		3,449,112	0
Private Placement [Member] | Series A Warrants [Member] | 2019 Equity Offering [Member]
Class Of Stock [Line Items]
Warrant exercise price per share	$ 4.00
Warrants exercisable term	18 months
Private Placement [Member] | Series B Warrants [Member] | 2019 Equity Offering [Member]
Class Of Stock [Line Items]
Warrant exercise price per share	$ 4.00
Warrants exercisable term	5 years
Placement Agent [Member]
Class Of Stock [Line Items]
Warrants available for exercise		172,456	0
Placement Agent [Member] | 2019 Equity Offering [Member]
Class Of Stock [Line Items]
Warrant exercise price per share	$ 3.86875
Warrants offering price maturity date	Apr. 30, 2024
Common Stock [Member] | Private Placement [Member] | Series A Warrants [Member] | Maximum [Member] | 2019 Equity Offering [Member]
Class Of Stock [Line Items]
Warrants to issue shares of common stock	3,449,112
Common Stock [Member] | Private Placement [Member] | Series B Warrants [Member] | Maximum [Member] | 2019 Equity Offering [Member]
Class Of Stock [Line Items]
Warrants to issue shares of common stock	3,449,112
Piper Jaffray & Co. [Member] | Equity Distribution Agreement [Member]
Class Of Stock [Line Items]
Equity distribution agreement maximum value of common shares issuable		$ 8,700,000		$ 9,800,000
Piper Jaffray & Co. [Member] | Equity Distribution Agreement [Member] | Common Stock [Member]
Class Of Stock [Line Items]
Common stock number of shares issued		25,218
Proceeds from issuance of common stock		$ 110,000
H.C. Wainwright & Co., LLC, [Member] | Common Stock [Member] | Placement Agent [Member] | Maximum [Member] | 2019 Equity Offering [Member]
Class Of Stock [Line Items]
Warrants to issue shares of common stock	172,456

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