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Stockholders' Equity - Issuances of Warrants (Details)	Dec. 31, 2019 $ / shares shares
Class of Stock [Line Items]
No. of Warrants (in shares)	103,125
Warrant, May 22, 2020 Expiration
Class of Stock [Line Items]
No. of Warrants (in shares)	15,625
Exercise Price (usd per share) | $ / shares	$ 21.76
Warrant, May 23, 2020 Expiration
Class of Stock [Line Items]
No. of Warrants (in shares)	25,000
Exercise Price (usd per share) | $ / shares	$ 25.36
Warrant, November 13, 2022 Expiration
Class of Stock [Line Items]
No. of Warrants (in shares)	62,500
Exercise Price (usd per share) | $ / shares	$ 18.08

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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.

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