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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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