Stockholders' Equity - Warrants Outstanding by Expiration Date (Details) - $ / shares	Sep. 30, 2017	Jul. 23, 2015
Class of Warrant or Right [Line Items]
Shares issuable upon exercise (in shares)	7,270,070
May 2018
Class of Warrant or Right [Line Items]
Shares issuable upon exercise (in shares)	300,000
Exercise price (in usd per share)	$ 34.00
March 2020 (Tranche 1)
Class of Warrant or Right [Line Items]
Shares issuable upon exercise (in shares)	1,068,307
Exercise price (in usd per share)	$ 1.67
March 2020 (Tranche 2)
Class of Warrant or Right [Line Items]
Shares issuable upon exercise (in shares)	106,831
Exercise price (in usd per share)	$ 2.16
April 2022
Class of Warrant or Right [Line Items]
Shares issuable upon exercise (in shares)	251,500
Exercise price (in usd per share)	$ 1.75
May 2022
Class of Warrant or Right [Line Items]
Shares issuable upon exercise (in shares)	4,638,425
Exercise price (in usd per share)	$ 1.55
January 2023
Class of Warrant or Right [Line Items]
Shares issuable upon exercise (in shares)	428,620
Exercise price (in usd per share)	$ 8.80
March 2023
Class of Warrant or Right [Line Items]
Shares issuable upon exercise (in shares)	441,763
Exercise price (in usd per share)	$ 8.80
October 2024
Class of Warrant or Right [Line Items]
Shares issuable upon exercise (in shares)	19,380
Exercise price (in usd per share)	$ 12.90
July 2025
Class of Warrant or Right [Line Items]
Shares issuable upon exercise (in shares)	15,244	15,244
Exercise price (in usd per share)	$ 16.40	$ 16.40

Exercise price per share or per unit of warrants or rights outstanding.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

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+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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