Common Stock, Common Stock Warrants and Stock Option Plan - Common Stock Warrants - Tabular Disclosure (Details) - $ / shares	Mar. 31, 2020	Dec. 31, 2019	May 08, 2018
Common Stock Warrants [Member]
Class of Warrant or Right [Line Items]
Warrants to purchase common stock (in shares)	1,165,282	1,165,282
Exercise price of warrant	$ 6.93	$ 8.11
Common Stock Warrants Three [Member]
Class of Warrant or Right [Line Items]
Warrants to purchase common stock (in shares)	315,282	315,282
Exercise price of warrant	$ 2.38	$ 2.38
Common Stock Warrants, Tennenbaum Capital Partners, LLC Warrant [Member]
Class of Warrant or Right [Line Items]
Warrants to purchase common stock (in shares)	850,000	850,000	850,000
Exercise price of warrant	$ 8.62	$ 8.30	$ 8.62

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

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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- Definition

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+ References

No definition available.

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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ 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)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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