Quarterly report pursuant to Section 13 or 15(d)

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

v3.21.1
Financial Instruments - Schedule of Cash and Cash Equivalents (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]    
Total Cash and Debt Securities $ 127,459 $ 114,817
Total Fair Value, Cash and Debt Securities 127,459 114,817
Cash and cash equivalents 127,459 114,817
Cash [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cash and cash equivalents 57,435 44,795
Fair Value, Cash 57,435 44,795
Level 1 [Member] | Money Market Funds [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cash and cash equivalents 70,024 70,022
Cash and cash equivalents gross before unrealized losses 70,024 70,022
Fair Value, Cash $ 70,024 $ 70,022