Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2022	Jan. 01, 2022	Dec. 31, 2021
Summary Of Significant Accounting Policies [Line Items]
Long-term debt	$ 186,559,000		$ 151,310,000
Accumulated deficit	$ (588,005,000)		$ (624,193,000)
ASU 2020-06 [Member]
Summary Of Significant Accounting Policies [Line Items]
Change in accounting principle, accounting standards update, adoption [true false]	true
Accounting standards adopted date	Jan. 01, 2022
Long-term debt		$ 185,655,000
Reduction of additional paid-in-capital	$ 48,300,000
Accumulated deficit		(610,198,000)
Amortization of debt discounts as interest expense	$ 0
ASU 2020-06 [Member] | Revision of Prior Period, Adjustment [Member]
Summary Of Significant Accounting Policies [Line Items]
Long-term debt		34,345,000
Accumulated deficit		13,995,000
ASU 2020-06 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Revision of Prior Period, Adjustment [Member]
Summary Of Significant Accounting Policies [Line Items]
Accumulated deficit		14,000,000.0
ASU 2020-06 [Member] | 2025 Notes [Member] | Revision of Prior Period, Adjustment [Member]
Summary Of Significant Accounting Policies [Line Items]
Long-term debt		$ 34,300,000