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Fair Value Measurements - Assumptions (Detail)		12 Months Ended
	Sep. 26, 2016	Dec. 31, 2015
Series Seed preferred stock warrants
Fair Value of preferred stock warrants
Contractual term (years)	4 years 10 months 25 days	5 years 8 months 12 days
Expected volatility	59.10%	60.30%
Risk-free interest rate	1.12%	1.84%
Estimated dividend yield	0.00%	0.00%
Series A-3 preferred stock warrants
Fair Value of preferred stock warrants
Contractual term (years)	6 years 6 months	7 years 2 months 12 days
Expected volatility	59.10%	61.30%
Risk-free interest rate	1.34%	2.09%
Estimated dividend yield	0.00%	0.00%

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- Definition

Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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-Section 50
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Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

+ 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)
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Risk-free interest rate assumption used in valuing an instrument.

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-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
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