Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

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

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	Dec. 22, 2017	Dec. 31, 2017
Income Taxes [Line Items]
Deferred tax asset related to TCJA	$ 600
Trs Lessee One
Income Taxes [Line Items]
Deferred tax asset		$ 30