Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2021 USD ($) Segment shares	Dec. 31, 2020 USD ($) shares	Dec. 17, 2020 shares	Apr. 09, 2020	Dec. 31, 2019 USD ($)
Subsidiary, Sale of Stock [Line Items]
Cash, cash equivalents, and restricted cash | $	$ 104,702,000	$ 93,314,000			$ 42,193,000
Allowance for doubtful accounts | $	$ 0
Interest rate				6.00%
Operating segments (number) | Segment	1
ASU 2019-12
Subsidiary, Sale of Stock [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Mar. 31, 2021
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]	true
ASU 2018-13
Subsidiary, Sale of Stock [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Dec. 31, 2020
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]	true
December 2020 Public Offering
Subsidiary, Sale of Stock [Line Items]
Number of warrants issued to purchase common stock (in shares) | shares	2,060,000
December 2020 Public Offering | Pre-funded Warrants
Subsidiary, Sale of Stock [Line Items]
Number of warrants issued to purchase common stock (in shares) | shares	5,260,000	5,260,000	5,260,000
6.0% April 2020 and March 2019 Convertible Senior Notes
Subsidiary, Sale of Stock [Line Items]
Interest rate	6.00%
Minimum
Subsidiary, Sale of Stock [Line Items]
Contract with customer, payment term	70 days
Maximum
Subsidiary, Sale of Stock [Line Items]
Contract with customer, payment term	90 days
Customer contract cost, amortization periods	1 year