Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) Segment	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Percentage of likelihood of realization required to record tax benefit	50.00%
Number of reportable segment | Segment	1
Operating lease, liability	$ 18,375
Operating lease right-of-use assets	19,137
Retained earnings	$ (300,878)		$ (201,025)
ASU 2016-02 [Member]
Summary Of Significant Accounting Policies [Line Items]
Operating lease, liability		$ 20,600
Operating lease right-of-use assets		22,300
ASU 2016-02 [Member] | Restatement Adjustment [Member]
Summary Of Significant Accounting Policies [Line Items]
Retained earnings		$ 300
Maximum [Member] | ASU 2016-02 [Member]
Summary Of Significant Accounting Policies [Line Items]
Maximum lease term	12 months