Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	Jan. 01, 2019	Mar. 31, 2020	Dec. 31, 2019
Significant Accounting Policies [Line Items]
Operating lease, right-of-use asset	$ 27,800	$ 25,843	$ 26,385
Operating lease, liability, current		2,652	2,571
Operating lease, liability, noncurrent		$ 27,419	$ 28,170
Accounting Standards Update 2016-02 [Member]
Significant Accounting Policies [Line Items]
Operating lease, right-of-use asset	27,500
Operating lease, liability, current	2,900
Operating lease, liability, noncurrent	29,200
Accounting Standards Update 2016-02 [Member] | Deferred Rent [Member]
Significant Accounting Policies [Line Items]
Operating lease, expense	4,900
Accounting Standards Update 2016-02 [Member] | Prepaid Rent [Member]
Significant Accounting Policies [Line Items]
Operating lease, expense	$ 300