Quarterly report pursuant to Section 13 or 15(d)

Condensed Financial Statements - Summary of Statements of Certain Statements of Cash Flows Amounts (Detail)

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Condensed Financial Statements - Summary of Statements of Certain Statements of Cash Flows Amounts (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]        
Cash and cash equivalents $ 3,875 $ 76,434 $ 58,610  
Restricted cash 1,433 1,509    
Total cash, cash equivalents, and restricted cash: 5,308 77,943 $ 60,038 $ 95,288
Short-term investments 29,942      
Total cash, cash equivalents, restricted cash, and short-term investments: 35,250 77,943    
Interest paid $ 732 $ 737