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Common Stock - Schedule of Number of Shares of Common Stock Reserved for Future Issuance (Detail) - shares | Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Class Of Stock [Line Items] |  |  |
Number of shares of common stock reserved for future issuance | 5,983,578 | 4,162,361 | 2,773,249
Options Issued and Outstanding |  |  |
Class Of Stock [Line Items] |  |  |
Number of shares of common stock reserved for future issuance | 2,302,435 | 2,562,800 | 1,122,677
Restricted stock units |  |  |
Class Of Stock [Line Items] |  |  |
Number of shares of common stock reserved for future issuance | 753,863 | 828,935 | 24,960
Options Available for Future Grants |  |  |
Class Of Stock [Line Items] |  |  |
Number of shares of common stock reserved for future issuance | 2,007,250 | 215,043 | 1,350,582
Shares Available for Issuance under the 2018 ESPP |  |  |
Class Of Stock [Line Items] |  |  |
Number of shares of common stock reserved for future issuance | 920,030 | 555,583 | 275,030
Previously Reported |  |  |
Class Of Stock [Line Items] |  |  |
Number of shares of common stock reserved for future issuance |  | 4,159,626 |
Previously Reported | Options Available for Future Grants |  |  |
Class Of Stock [Line Items] |  |  |
Number of shares of common stock reserved for future issuance |  | 212,308 |

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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