Investments - Schedule of Proceeds from Sales and Maturities of Marketable Securities Plus Resulting Realized Gains and Losses (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019
Investments Debt And Equity Securities [Abstract]
Proceeds from the sales and maturities of marketable securities	$ 147,859	$ 79,104
Realized gains	$ 51
Realized losses		$ 5

The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.

No definition available.

Name:	us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration