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Stock-Based Compensation - RSU - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) installment shares	Dec. 31, 2019 shares	Dec. 31, 2018 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of vesting equal installments | installment	36
Restricted Stock Units (RSU)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of vesting equal installments | installment	4
Full acceleration of vesting, employee or executive officer subject to involuntary termination, period post change of control of the Company	24 months
Unrecognized compensation expenses related to unvested RSUs | $	$ 18.3
Unrecognized compensation expenses, weighted average period	1 year 7 months 6 days
Grant date fair value of common stock vested (in shares) | shares	581,757	526,175	528,745
Grant date fair value of common stock vested | $	$ 9.6

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