Net Loss Per Share - Additional Information (Detail) - Underwriters - Common Stock - $ / shares	Jan. 04, 2021	Dec. 03, 2019	Aug. 14, 2018
Earnings Per Share [Line Items]
Underwriting agreement date		Dec. 03, 2019	Aug. 14, 2018
Number of shares issued in transaction		41,550,000	16,216,217
Sale of stock, price		$ 3.13	$ 9.25
Subsequent Event
Earnings Per Share [Line Items]
Underwriting agreement date	Jan. 04, 2021
Number of shares issued in transaction	11,856,500
Sale of stock, price	$ 4.85