Balance Sheet Components (Tables)

12 Months Ended

Dec. 31, 2018

Balance Sheet Related Disclosures [Abstract]

Schedule of Property and Equipment, Net

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

	December 31,
	2018			2017
Prototype	$	12,425		$	11,929
Machine and equipment		12,654			7,831
Leasehold improvements		4,600			4,438
Furniture and fixtures		636			558
Software		1,250			1,142
Construction in progress		148			—
Property and equipment, gross		31,713			25,898
Less: accumulated depreciation and amortization		(17,755	)		(14,334	)
Property and equipment, net	$	13,958		$	11,564

Schedule of Accrued Liabilities

Accrued liabilities consisted of the following (in thousands):

	December 31,
	2018		2017
Accrued payroll and related benefits	$	5,047	$	3,944
Accrued accounts payable		3,626		2,671
Payroll withholding tax, sales and other tax payable		782		149
Accrued legal and accounting		360		322
Other		168		121
Total accrued liabilities	$	9,983	$	7,207

Schedule of Deferred Revenue

Deferred revenue consisted of the following (in thousands):

	December 31,
	2018			2017
Deferred revenue:
Product	$	9,623		$	18,861
Services		6,981			1,182
Distribution rights		2,871			3,346
Total deferred revenue		19,475			23,389
Less: current portion of deferred revenue		(13,731	)		(20,151	)
Noncurrent portion of deferred revenue	$	5,744		$	3,238

Schedule of Other Long Term Liabilities

Other long-term liabilities consisted of the following (in thousands):

	December 31,
	2018		2017
Accrued interest, noncurrent portion	$	—	$	6,218
Deferred rent, noncurrent portion		628		167
Other		192		985
Total other-long term liabilities	$	820	$	7,370