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Fair Value of Financial Assets and Liabilities - Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Apr. 26, 2017
Warrant liability	$ 1,577	$ 520
Fair Value, Measurements, Recurring [Member]
Warrant liability	1,577	520
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Warrant liability
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Warrant liability
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Warrant liability	$ 1,577	$ 520

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- Definition

Fair value of financial and nonfinancial obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

+ Details

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