Summary of Significant Accounting Policies - Fair value of warrant (Details)	Sep. 30, 2019
MidCap Credit Facility
Fair value of the warrants
Remaining contractual term in years	8 years 7 months 6 days
Convertible promissory notes
Fair value of the warrants
Remaining contractual term in years	7 years 3 months 18 days
Notes payable
Fair value of the warrants
Remaining contractual term in years	7 years 6 months
Expected volatility \| MidCap Credit Facility
Fair value of the warrants
Fair value of warrants	0.5746
Expected volatility \| Convertible promissory notes
Fair value of the warrants
Fair value of warrants	0.5740
Expected volatility \| Notes payable
Fair value of the warrants
Fair value of warrants	0.5719
Risk-free interest rate \| MidCap Credit Facility
Fair value of the warrants
Fair value of warrants	0.0165
Risk-free interest rate \| Convertible promissory notes
Fair value of the warrants
Fair value of warrants	0.0162
Risk-free interest rate \| Notes payable
Fair value of the warrants
Fair value of warrants	0.0162

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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- Definition

Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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