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Non-Marketable Equity Investments - Additional Information (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Mar. 09, 2020
Jun. 30, 2020
Dec. 31, 2018
Dec. 31, 2019
Schedule Of Trading Securities And Other Trading Assets [Line Items]        
Aggregate carrying amount of non-marketable equity investments   $ 2,100   $ 4,500
Changes in adjustment to carrying value of non-marketable equity investment due to change in fair value   (1,181) $ 1,300  
Cumulative downward adjustments to carrying value of non-marketable equity investments   $ 100    
NurseGrid [Member]        
Schedule Of Trading Securities And Other Trading Assets [Line Items]        
Changes in adjustment to carrying value of non-marketable equity investment due to change in fair value $ 1,200