Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments - Schedule of Cash and Cash Equivalents (Detail)

v3.21.2
Financial Instruments - Schedule of Cash and Cash Equivalents (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]    
Total Cash and Debt Securities $ 72,645 $ 114,817
Total Fair Value, Cash and Debt Securities 72,645 114,817
Cash and cash equivalents 72,645 114,817
Cash [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cash and cash equivalents 71,616 44,795
Fair Value, Cash 71,616 44,795
Level 1 [Member] | Money Market Funds [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cash and cash equivalents 1,029 70,022
Cash and cash equivalents gross before unrealized losses 1,029 70,022
Fair Value, Cash $ 1,029 $ 70,022