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Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value Assets Liabilities Quantitative Information [Line Items]
Fair value of warrant derivative liabilities at issuance, recorded as debt discount	$ 35	$ 35	$ 11
Fair Value, Measurements, Recurring [Member] | Embedded Compound Derivative [Member]
Fair Value Assets Liabilities Quantitative Information [Line Items]
Derivative liability		35
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Embedded Compound Derivative [Member]
Fair Value Assets Liabilities Quantitative Information [Line Items]
Derivative liability	$ 11	$ 35

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- Definition

Fair value of financial and nonfinancial obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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