Investments In Marketable Securities - Additional Information (Details)	6 Months Ended
Jun. 30, 2019 Security	Dec. 31, 2018 USD ($)
Investments Debt And Equity Securities [Abstract]
Marketable securities \| $		$ 0
Number of securities in unrealized loss position \| Security	0

Amount of investment in marketable security.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.4)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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