Summary of Significant Accounting Policies - Fair value of warrant (Details)	Nov. 13, 2019	Dec. 31, 2018
MidCap Credit Facility
Fair value of the warrants
Remaining contractual term in years	8 years 4 months 24 days	9 years 3 months 18 days
Convertible promissory notes
Fair value of the warrants
Remaining contractual term in years	7 years 2 months 12 days	8 years 1 month 6 days
Notes payable
Fair value of the warrants
Remaining contractual term in years	7 years 4 months 24 days	8 years 3 months 18 days
Expected volatility \| MidCap Credit Facility
Fair value of the warrants
Fair value of warrants	57.5	58.1
Expected volatility \| Convertible promissory notes
Fair value of the warrants
Fair value of warrants	57.4	57.0
Expected volatility \| Notes payable
Fair value of the warrants
Fair value of warrants	57.5	57.4
Risk-free interest rate \| MidCap Credit Facility
Fair value of the warrants
Fair value of warrants	2.04	2.69
Risk-free interest rate \| Convertible promissory notes
Fair value of the warrants
Fair value of warrants	1.79	2.64
Risk-free interest rate \| Notes payable
Fair value of the warrants
Fair value of warrants	1.79	2.64

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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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