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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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