Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2016

Schedule of Revenue and Accounts Receivable for Each Significant Customer

	Revenue						Accounts Receivable
	Year Ended December 31,						December 31,
Customers	2016		2015		2014		2016		2015
Customer A	22	%	26	%	26	%	12	%	28	%
Customer B	*		13		13		13		23
Customer C	*		*		15		*		*
Customer D	*		*		*		10		*
Customer E	12		*		*		18		*

*Less than 10%

Schedule of Fair Value of Financial Assets and Liabilities Measured on Recurring Basis

The following table sets forth the fair value of the Company’s financial assets and liabilities measured at fair value on a recurring basis based on the three-tier fair value hierarchy (in thousands):

	December 31, 2016
	Level 1		Level 2		Level 3			Total
Assets:
Money market funds	$	29,869	$	—	$	—	$	29,869
Total assets measured at fair value	$	29,869	$	—	$	—	$	29,869

	December 31, 2015
	Level 1		Level 2		Level 3			Total
Assets:
Money market funds	$	2,354	$	—	$	—	$	2,354
Total assets measured at fair value	$	2,354	$	—	$	—	$	2,354
Liabilities:
Redeemable convertible preferred stock warrant liability	$	—	$	—	$	437	$	437
Total liabilities measured at fair value	$	—	$	—	$	437	$	437

Schedule of estimated useful lives of the assets

	Useful Lives
Computer and network equipment		2 years
Manufacturing equipment		2 – 7 years
Furniture and fixtures		7 years
Software		3 years

Redeemable Convertible Preferred Stock Warrants

Schedule of Change in Fair Value of Liability

The following table sets forth a summary of the changes in the fair value of the redeemable convertible preferred stock warrant liability, a Level 3 financial liability, which is measured on a recurring basis (in thousands):

	December 31,
	2016		2015		2014
Beginning balance	$	437	$	145	$	45
Issuance of redeemable convertible preferred stock warrants		—		307		106
Change in fair value recorded in other income (expense), net		(372)		(15)		(6)
Reclassification to additional paid-in capital		(65)		—		—
Ending balance	$	—	$	437	$	145

Schedule of Assumptions Used in Valuation of Redeemable Convertible Preferred Stock Warrants

	Year Ended December 31,
	2016			2015			2014
Expected volatility		42.4 – 52.0	%		43.6 – 52.9	%		52.8 - 53.8	%
Risk-free interest rate		1.22 – 1.86	%		1.76 – 2.27	%		1.81 – 2.17	%
Expected term (in years)		4 – 9			5 – 10			6 – 10
Exercise price	$	26.00		$	26.00		$	26.00
Dividend yield		—	%		—	%		—	%

Derivative Liability

Summary of the changes in the fair value of the derivative liability, a Level 3 financial liability, which is measured on a recurring basis

The following table sets forth a summary of the changes in the fair value of the derivative liability, a Level 3 financial liability, which is measured on a recurring basis (in thousands):

Balance at December 31, 2015	$	—
Issuance of derivative liability		918
Change in fair value recorded in other income (expense), net		(798)
Reclassification to additional paid-in capital		(120)
Balance at December 31, 2016	$	—