Condensed Consolidated Statements of Cash Flows (Parenthetical) (Unaudited) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019
Follow-on Offering [Member]
Net of issuance costs	$ 0.4
At-the-Market Offerings [Member]
Net of issuance costs	$ 0.1	$ 0.1

The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

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