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Warrants to Purchase Common or Preferred Stock - Outstanding warrants (Details)	Dec. 31, 2019 $ / shares shares
Class of Warrant or Right [Line Items]
Common stock warrants (in shares)	461,273
Warrant expiration January 19, 2026
Class of Warrant or Right [Line Items]
Common stock warrants (in shares)	282,402
Exercise Price | $ / shares	$ 1.84
Warrant expiration March 31, 2026
Class of Warrant or Right [Line Items]
Common stock warrants (in shares)	74,018
Exercise Price | $ / shares	$ 1.84
Warrant expiration April 1, 2026
Class of Warrant or Right [Line Items]
Common stock warrants (in shares)	131
Exercise Price | $ / shares	$ 1.84
Warrant expiration September 8, 2024
Class of Warrant or Right [Line Items]
Common stock warrants (in shares)	83,778
Exercise Price | $ / shares	$ 14.32
Warrant expiration December 7, 2025
Class of Warrant or Right [Line Items]
Common stock warrants (in shares)	20,944
Exercise Price | $ / shares	$ 14.32

X

- 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

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Number 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))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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