Warrants - Issued and Outstanding (Details) - Common Stock - USD ($) $ / shares in Units, $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Oct. 16, 2018
Class of Warrant or Right [Line Items]
Number of Shares Underlying Warrants (in shares)			160,657
Warrants Issued 3/1/2017
Class of Warrant or Right [Line Items]
Number of Shares Underlying Warrants (in shares)	1,388	1,388
Price per Share (in dollars per share)	$ 5.94	$ 5.94
Fair Value	$ 5	$ 5
Warrants Issued 7/22/2013
Class of Warrant or Right [Line Items]
Number of Shares Underlying Warrants (in shares)	32,983	32,983
Price per Share (in dollars per share)	$ 9.1	$ 9.1
Fair Value	$ 122	$ 122
Warrants Issued 11/26/2014
Class of Warrant or Right [Line Items]
Number of Shares Underlying Warrants (in shares)	6,680	6,680
Price per Share (in dollars per share)	$ 16.47	$ 16.47
Fair Value	$ 49	$ 49
Warrants Issued 10/20/2015
Class of Warrant or Right [Line Items]
Number of Shares Underlying Warrants (in shares)	41,650	41,650
Price per Share (in dollars per share)	$ 16.47	$ 16.47
Fair Value	$ 396	$ 396
Warrants Issued 11/9/2015
Class of Warrant or Right [Line Items]
Number of Shares Underlying Warrants (in shares)	25,709	25,709
Price per Share (in dollars per share)	$ 16.47	$ 16.47
Fair Value	$ 244	$ 244
Warrants Issued 12/22/2016
Class of Warrant or Right [Line Items]
Number of Shares Underlying Warrants (in shares)	9,712	9,712
Price per Share (in dollars per share)	$ 10.03	$ 10.03
Fair Value	$ 45	$ 45
Common Stock Warrants
Class of Warrant or Right [Line Items]
Number of Shares Underlying Warrants (in shares)	118,122	118,122
Fair Value	$ 861	$ 861

Warrants Outstanding, Fair Value On Date Of Issuance Or Conversion

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- 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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- Definition

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.

+ References

No definition available.

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- Definition

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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