Balance Sheet Components (Tables)

9 Months Ended

Sep. 30, 2015

Balance Sheet Related Disclosures [Abstract]

Schedule of Property and Equipment

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

	September 30, 2015			December 31, 2014
	(Unaudited)
Prototype	$	6,471		$	6,342
Machine and equipment		5,605			4,214
Leasehold improvements		1,274			1,270
Furniture and fixtures		347			263
Software		790			647
Construction in progress		1,402			—
Property and equipment, gross		15,889			12,736
Less: accumulated depreciation and amortization		(10,593	)		(9,805	)
Property and equipment, net	$	5,296		$	2,931

Summary of Intangible Assets

Intangible assets consisted of the following (in thousands):

	September 30, 2015			December 31, 2014
	(Unaudited)
Intangible assets – license cost	$	500		$	500
Accumulated amortization		(361	)		(236	)
Intangible assets, net	$	139		$	264

Summary of Estimated Future Amortization Expense

At September 30, 2015, 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 2015	$	42
2016		97
Total amortization expense	$	139

Schedule of Accrued Liabilities

Accrued liabilities consisted of the following (in thousands):

	September 30, 2015		December 31, 2014
	(Unaudited)
Accrued payroll and related benefits	$	1,779	$	1,652
Accrued accounts payable		478		946
Sales tax and medical device excise tax payable		33		499
Accrued legal and accounting		410		901
Accrued interest		—		142
Accrued debt facility fee		1,500		—
Other		814		296
Total accrued liabilities	$	5,014	$	4,436

Schedule of Deferred Revenue

Deferred revenue consisted of the following (in thousands):

	September 30, 2015			December 31, 2014
	(Unaudited)
Deferred revenue:
Product	$	5,050		$	6,919
Services		573			442
Total deferred revenue		5,623			7,361
Less: current portion of deferred revenue		(5,249	)		(7,361	)
Noncurrent portion of deferred revenue	$	374		$	—