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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2020 | May 30, 2020 | May 16, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  | 4 years |  |
Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period | 4 years | 4 years | 36 months |  |
Vesting rights percentage |  |  | 25.00% |  |
Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  | 4 years |  |
Restricted Stock | Tranche One |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting rights percentage |  |  | 25.00% |  |
Options and PNQs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation expense related to options |  |  | $ 5.6 |  |
Unrecognized compensation expense, weighted average period for recognition |  |  | 2 years 2 months 12 days |  |
RSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation expense, weighted average period for recognition |  |  | 3 years 8 months 12 days |  |
Unrecognized compensation expense related to non-option |  |  | $ 5.8 |  |
Market RSU's |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation expense, weighted average period for recognition |  |  | 2 years 7 months 6 days |  |
Unrecognized compensation expense related to non-option |  |  | $ 5.7 |  |
Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  | 10 years |  |
2018 Equity Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Equity incentive plan, shares |  |  |  |  | 12,000,000
Equity incentive plan, number of shares available for grant increased by shares |  |  |  | 12,500,000 |
Exercise or strike price of fair market value of underlying common stock on date of grant reacquired or withheld |  |  |  |  | 100.00%
2013 Equity Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Equity incentive plan, shares |  |  |  |  | 0

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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