Subsequent event - Additional Information (Detail) - Offering - USD ($) $ / shares in Units, $ in Thousands	Jan. 31, 2022	Jan. 27, 2020	Jun. 24, 2019
Subsequent Event [Line Items]
Warrants issued price per pre funded warrant (in dollars per share)		$ 46.4999	$ 17.9999
Net proceeds from issuance		$ 300,910	$ 188,005
Subsequent Event
Subsequent Event [Line Items]
Number of shares issued, public offering	11,035,000
Share issued, price per share (in dollars per share)	$ 8.00
Class of warrant or right, pre-funded (in shares)	3,340,000
Warrants issued price per pre funded warrant (in dollars per share)	$ 7.9999
Gross proceeds from issuance	$ 115,000
Net proceeds from issuance	$ 107,600