Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
Summary Of Significant Accounting Policies [Line Items]
Restricted cash, current	$ 593	$ 25
Restricted cash, non-current		568
Aggregate gross proceeds from sale of common stock	16,881
Placement agent fees	$ 1,494
Lease, practical expedients, package [true false]	true
ASU No. 2016-02 [Member]
Summary Of Significant Accounting Policies [Line Items]
Change in accounting principle, ASU adoption date	Jan. 01, 2019
Change in accounting principle, ASU adopted	true
490 Arsenal Way [Member] | Operating Lease Agreements [Member] | ASU No. 2016-02 [Member]
Summary Of Significant Accounting Policies [Line Items]
De-recognized building asset			$ 7,079
De-recognition of accumulated depreciation			$ 81
Private Placement [Member]
Summary Of Significant Accounting Policies [Line Items]
Placement agent fees		2,200
Aggregate gross proceeds from private placement		26,000
Security Deposit Related to Lease Facilities and Credit Card Accounts [Member]
Summary Of Significant Accounting Policies [Line Items]
Restricted cash, current	$ 593
Security Deposit Related to Credit Card Accounts [Member]
Summary Of Significant Accounting Policies [Line Items]
Restricted cash, current		25
Security Deposit Related to Lease Facility [Member]
Summary Of Significant Accounting Policies [Line Items]
Restricted cash, non-current		$ 568