Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.2
Financial Instruments - Schedule of Cash and Cash Equivalents (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Schedule Of Available For Sale Securities [Line Items]    
Cash and cash equivalents $ 54,315 $ 44,065
Total Cash and Debt Securities 54,315 44,065
Total Fair Value, Cash and Debt Securities 54,315 44,065
Cash [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cash and cash equivalents 43,289 23,710
Fair Value, Cash 43,289 23,710
Level 1 [Member] | Money Market Funds [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cash and cash equivalents 11,026 20,355
Fair Value, Cash $ 11,026 20,355
Cash and cash equivalents gross before unrealized losses   $ 20,355