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Organization - Additional Information (Detail) - USD ($) |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 10, 2019 | Mar. 22, 2019 | Feb. 01, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |
Entity incorporation date |  |  |  | Jul. 05, 2016 |  |  |
Net proceeds received from offering |  |  |  |  | $ 46,816,000 | $ 49,747,000 | $ 90,908,000
Accumulated deficit |  |  |  | $ 161,170,000 |  | 154,132,000 | 71,393,000
Cash, cash equivalents and marketable securities |  |  |  |  |  |  | 91,500,000
Initial Public Offering |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |
Number of common stock shares sold | 487,934 | 7,200,000 |  |  |  |  |
Issuance price per shares | $ 6.95 | $ 6.95 |  |  |  |  |
Net proceeds received from offering | $ 3,200,000 | $ 46,600,000 |  |  |  |  |
Underwriting discounts and commissions and other offering expenses | $ 200,000 | $ 3,500,000 |  |  |  |  |
Net proceeds received from offering |  |  |  |  | $ 46,585,000 | 49,747,000 | $ 89,370,000
Initial Public Offering | Maximum |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |
Option to purchase of common stock at public offering price |  | 1,080,000 |  |  |  |  |
At-the-Market Offering |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |
Net proceeds received from offering |  |  |  |  |  | $ 6,716,000 |
At-the-Market Offering | Controlled Equity Offering Sales Agreement | SVB Leerink LLC and Cantor Fitzgerald and Co |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |
Number of common stock shares sold |  |  |  |  |  | 688,000 |
Issuance price per shares |  |  |  |  |  | $ 10.18 |
Maximum aggregate value of common stock available for offering At-the-Market price |  |  | $ 50,000,000 |  |  |  |
Sales commission percentage payable to sales agents in cash |  |  | 3.00% |  |  |  |
Net proceeds received from offering |  |  |  |  |  | $ 6,700,000 |
Issuance costs |  |  |  |  |  | 75,000 |
Common stock remained available for offering |  |  |  |  |  | $ 43,000,000 |

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