Balance Sheet Components (Tables)

6 Months Ended

Jun. 30, 2018

Balance Sheet Related Disclosures [Abstract]

Schedule of Property and Equipment

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

	June 30, 2018			December 31, 2017
Prototype	$	12,622		$	11,929
Machinery and equipment		10,732			7,831
Leasehold improvements		4,327			4,438
Software		1,228			1,142
Furniture and fixtures		588			558
Property and equipment, gross		29,497			25,898
Less: accumulated depreciation and amortization		(15,910	)		(14,334	)
Property and equipment, net	$	13,587		$	11,564

Schedule of Accrued Liabilities

Accrued liabilities consisted of the following (in thousands):

	June 30, 2018		December 31, 2017
Accrued payroll and related benefits	$	4,049	$	3,944
Accrued accounts payable		1,625		2,671
Sales and other tax payable		1,607		149
Accrued legal, accounting and professional fees		313		322
Other		56		121
Total accrued liabilities	$	7,650	$	7,207

Schedule of Deferred Revenue

Deferred revenue consisted of the following (in thousands):

	June 30, 2018			December 31, 2017
Deferred revenue:
Product	$	11,917		$	18,861
Services		4,908			1,182
Distribution rights		3,108			3,346
Total deferred revenue		19,933			23,389
Less: current portion of deferred revenue		(15,540	)		(20,151	)
Noncurrent portion of deferred revenue	$	4,393		$	3,238

Schedule of Other Long Term Liabilities

Other Long-Term Liabilities

	June 30, 2018		December 31, 2017
Accrued interest, noncurrent portion	$	7,894	$	6,218
Deferred rent, noncurrent portion		378		167
Other		828		985
Total other-long term liabilities	$	9,100	$	7,370