Financings - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands					1 Months Ended	12 Months Ended
	Mar. 10, 2020	Feb. 05, 2020	Sep. 12, 2019	Nov. 11, 2018	Jun. 30, 2019	Dec. 31, 2021	Dec. 31, 2020	Aug. 06, 2021
Class of Stock [Line Items]
Sale of stock consideration received on transaction						$ 0	$ 88,661
Common stock, par value						$ 0.001	$ 0.001
Issuance of common stock in connection with an at the market offering, net							$ 13,016
Proceeds from private placement			$ 52,500
At The Market Offering [Member]
Class of Stock [Line Items]
Stock issued during period							2,814,673
At The Market Offering [Member] | Maximum [Member]
Class of Stock [Line Items]
Issuance of common stock in connection with an at the market offering, net					$ 100,000
Private Placement [Member]
Class of Stock [Line Items]
Number of securities into which the class of warrant converted			17,803,031	18,939,394
Warrant exercise per share			$ 3.01	$ 3.01
Placement agent fees and other expenses			$ 1,100
Private Placement [Member] | New Warrants [Member]
Class of Stock [Line Items]
Number of securities into which the class of warrant converted			17,803,031
Warrant exercise per share			$ 7.00
Securities Purchase Agreement [Member]
Class of Stock [Line Items]
Issuance of common stock in connection with an at the market offering, net				$ 47,100
Underwriting Agreement [Member]
Class of Stock [Line Items]
Common stock issuance		27,826,086
Issuance & sale of common stock in public offering price per share		$ 3.25
Sale of stock consideration received on transaction		$ 84,800
Underwriting Agreement [Member] | Stock Option [Member]
Class of Stock [Line Items]
Stock issued during period	1,284,025
Sale of stock consideration received on transaction	$ 3,900
Underwriting Agreement [Member] | At The Market Offering [Member]
Class of Stock [Line Items]
Sale of stock consideration received on transaction							$ 13,000
Silicon Valley Bank [Member] | Term A Tranche
Class of Stock [Line Items]
Loan and Security Agreement								$ 25,000
Silicon Valley Bank [Member] | Term B Tranche
Class of Stock [Line Items]
Additonal tranche facility								$ 25,000