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Fair Value Measurements (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2017

Dec. 31, 2016

Fair Value Disclosures [Abstract]

Schedule of Assumptions used to Estimate Fair Value of Warrant Liability

The following assumptions were used to estimate the fair value of the common stock warrant liability at September 30, 2017:

	September 30, 2017
Expected term	2.0 years
Risk-free interest rate	1.46	%
Expected volatility	78.78	%
Expected dividend yield	—	%

The following assumptions were used to estimate the fair value of the preferred stock warrant liability at December 31, 2016:

	December 31, 2016
Expected term	4.6
Risk-free interest rate	1.82	%
Expected volatility	76.2	%
Expected dividend yield	—	%

Reconciliation of Liabilities Measured at Fair Value on a Recurring Basis

The following is a reconciliation of the Company’s liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3) for the nine months ended September 30, 2017:

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
	Preferred Stock Warrant Liability				Common Stock Warrant Liability				Total
Balance at January 1, 2017	$	201			$	—			$	201
Additions	—				211				211
Loss included in other income (expense), net	(201		)		—				(201		)
Balance at September 30, 2017	$	—			$	211			$	211

The following is a reconciliation of the Company’s liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3) for the year ended December 31, 2016:

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
Balance at January 1, 2016	$	—
Issuance of preferred stock warrant liability	134
Loss included in other income (expense), net	67
Balance at December 31, 2016	$	201

X

- Definition

Tabular disclosure of the inputs and valuation techniques used to measure fair value, and a discussion of changes in valuation techniques and related inputs, if any, applied during the period to each separate class of assets, liabilities, and financial instruments classified in shareholders' equity that are measured on a recurring and/or nonrecurring basis.

+ 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 (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- References

No definition available.

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X

- Definition

Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258

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

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