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 |