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Balance Sheet Components (Tables)

9 Months Ended

Sep. 30, 2016

Property and equipment consisted of the following (in thousands):

	September 30, 2016			December 31, 2015
	(Unaudited)
Prototype	$	6,405		$	6,492
Machinery and equipment		6,148			7,128
Leasehold improvements		4,621			1,532
Furniture and fixtures		363			350
Software		960			832
Construction in progress		5,331			1,851
Property and equipment, gross		23,828			18,185
Less: accumulated depreciation and amortization		(11,920	)		(10,879	)
Property and equipment, net	$	11,908		$	7,306

Intangible assets consisted of the following (in thousands):

At September 30, 2016, the estimated future amortization expense of purchased intangible assets was as follows (in thousands):

Year Ending December 31,	Estimated Future Amortization Expense
	(Unaudited)
The remainder of 2016	$	5
2017		19
2018		19
2019		19
2020		19
2021		11
Thereafter		10
Total amortization expense	$	102

Accrued liabilities consisted of the following (in thousands):

	September 30, 2016		December 31, 2015
	(Unaudited)
Accrued payroll and related benefits	$	3,123	$	1,938
Accrued accounts payable		1,199		1,880
Sales tax and medical device excise tax payable		96		219
Accrued legal, accounting and governance fees		783		857
Other		417		519
Total accrued liabilities	$	5,618	$	5,413

Deferred revenue consisted of the following (in thousands):

	September 30, 2016			December 31, 2015
	(Unaudited)
Deferred revenue:
Product	$	10,900		$	5,050
Services		821			911
Distribution rights (see Note 7)		3,941			—
Total deferred revenue		15,662			5,961
Less: current portion of deferred revenue		(12,006	)		(5,616	)
Noncurrent portion of deferred revenue	$	3,656		$	345