Cash and Investments - Short-term Investments (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 5,084	$ 5,012
Gross Unrealized Losses	(61)
Estimated Fair Value	5,023	5,012
Bond Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,084	5,012
Gross Unrealized Losses	(61)
Estimated Fair Value	$ 5,023	$ 5,012

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

No definition available.

Name:	us-gaap_AvailableForSaleSecuritiesAmortizedCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant