Balance Sheet Components (Tables)

3 Months Ended

Mar. 31, 2016

Balance Sheet Related Disclosures [Abstract]

Schedule of Property and Equipment

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

	March 31, 2016			December 31, 2015
	(Unaudited)
Prototype	$	6,476		$	6,492
Machinery and equipment		8,871			7,128
Leasehold improvements		1,524			1,532
Furniture and fixtures		359			350
Software		866			832
Construction in progress		4,506			1,851
Property and equipment, gross		22,602			18,185
Less: accumulated depreciation and amortization		(11,189	)		(10,879	)
Property and equipment, net	$	11,413		$	7,306

Summary of Intangible Assets

Intangible assets consisted of the following (in thousands):

	March 31, 2016			December 31, 2015
	(Unaudited)
License cost	$	500		$	500
Patents		104			104
Intangible assets, gross	$	604		$	604
Accumulated amortization		(450	)		(404	)
Intangible assets, net	$	154		$	200

Summary of Estimated Future Amortization Expense

At March 31, 2016, the estimated future amortization expense of purchased intangible assets was as follows (in thousands):

Year Ending December 31,	EstimatedFuture Amortization Expense
	(Unaudited)
The remainder of 2016	$	69
2017		18
2018		18
2019		18
2020		18
2021		13
Thereafter		—
Total amortization expense	$	154

Schedule of Accrued Liabilities

Accrued liabilities consisted of the following (in thousands):

	March 31, 2016		December 31, 2015
	(Unaudited)
Accrued payroll and related benefits	$	2,205	$	1,938
Accrued accounts payable		1,055		1,880
Sales tax and medical device excise tax payable		343		219
Accrued legal and accounting		813		857
Other		693		519
Total accrued liabilities	$	5,109	$	5,413

Schedule of Deferred Revenue

Deferred revenue consisted of the following (in thousands):

	March 31, 2016			December 31, 2015
	(Unaudited)
Deferred revenue:
Product	$	5,050		$	5,050
Services		1,268			911
Total deferred revenue		6,318			5,961
Less: current portion of deferred revenue		(5,889	)		(5,616	)
Noncurrent portion of deferred revenue	$	429		$	345