Description of Business - Additional Information (Details) - At The Market Equity Offering $ in Millions	1 Months Ended
Jan. 31, 2018 USD ($)
Subsidiary, Sale of Stock [Line Items]
Proceeds from sale of common stock, net	$ 40.0
Commission expense, percentage	3.00%

The cash inflow from the additional capital contribution to the entity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585

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