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Net Income (Loss) Per Share Attributable to Common Shareholders - Schedule of Antidilutive Securities not Include in Computation of Net Income (Loss) per Share (Detail) - shares | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities not include in computation of net income (loss) per share | 8,842,224 | 3,805,225 | 8,842,224 | 3,945,321
Outstanding Options [Member] |  |  |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities not include in computation of net income (loss) per share | 7,932,906 | 3,791,475 | 7,932,906 | 3,911,071
Unvested Restricted Common Shares [Member] |  |  |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities not include in computation of net income (loss) per share | 897,510 | 13,750 | 897,510 | 34,250
ESPP [Member] |  |  |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities not include in computation of net income (loss) per share | 11,808 |  | 11,808 |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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