Subsequent Events - Securities Purchase Agreement (Details) - USD ($) $ / shares in Units, $ in Millions	Nov. 13, 2019	Sep. 30, 2019
Subsequent Events.
Exercise price (in dollars per share)		$ 49.00
Investors \| Subsequent event \| Pre-funded Warrants \| Securities purchase agreement
Subsequent Events.
Purchase of shares by issuing warrants	2,222,223
Offer price (per share)	$ 0.80
Exercise price (in dollars per share)	$ 0.01
Gross proceeds from issuance of pre-funded warrants	$ 1.8

Offering price per share or per unit of warrants or rights issued.

No definition available.

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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

+ Details

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- Definition

Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

+ References

No definition available.

+ Details

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- Definition

The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

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