Marketable Securities - Narrative (Details)	12 Months Ended
Dec. 31, 2019 USD ($)
Investments, Debt and Equity Securities [Abstract]
Realized loss on sales of marketable securities	$ 0

Amount of realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI).

No definition available.

Name:	us-gaap_MarketableSecuritiesRealizedGainLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration