The price per share of the conversion feature embedded in the debt instrument.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870

Name:	us-gaap_DebtInstrumentConvertibleConversionPrice1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

Debt - Supplemental Indenture (Details) - $ / shares	May 23, 2017	Sep. 30, 2017	Sep. 20, 2017	Sep. 28, 2016
Debt Instrument [Line Items]
Indenture, minimum percentage of note holders for waiver	66.67%
Convertible notes
Debt Instrument [Line Items]
Convertible debt conversion price (in dollars per share)		$ 1.364	$ 1.364	$ 1.364