Balance Sheet Components (Tables)

9 Months Ended

Sep. 30, 2018

Balance Sheet Related Disclosures [Abstract]

Schedule of Property and Equipment

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

	September 30, 2018			December 31, 2017
Prototype	$	12,425		$	11,929
Machinery and equipment		11,684			7,831
Leasehold improvements		4,327			4,438
Software		1,244			1,142
Furniture and fixtures		588			558
Property and equipment, gross		30,268			25,898
Less: accumulated depreciation and amortization		(16,816	)		(14,334	)
Property and equipment, net	$	13,452		$	11,564

Schedule of Accrued Liabilities

Accrued liabilities consisted of the following (in thousands):

	September 30, 2018		December 31, 2017
Accrued payroll and related benefits	$	5,951	$	3,944
Accrued accounts payable		2,642		2,671
Payroll withholding tax, sales and other tax payable		4,733		149
Accrued legal, accounting and professional fees		498		322
Other		56		121
Total accrued liabilities	$	13,880	$	7,207

Schedule of Deferred Revenue

Deferred revenue consisted of the following (in thousands):

	September 30, 2018			December 31, 2017
Deferred revenue:
Product	$	7,478		$	18,861
Service		6,053			1,182
Distribution rights		2,990			3,346
Total deferred revenue		16,521			23,389
Less: current portion of deferred revenue		(11,315	)		(20,151	)
Noncurrent portion of deferred revenue	$	5,206		$	3,238

Schedule of Other Long Term Liabilities

Other Long-Term Liabilities

	September 30, 2018		December 31, 2017
Accrued interest, noncurrent portion	$	8,777	$	6,218
Deferred rent, noncurrent portion		492		167
Other		585		985
Total other-long term liabilities	$	9,854	$	7,370