Balance Sheet Components (Tables)

9 Months Ended

Sep. 30, 2020

Balance Sheet Related Disclosures [Abstract]

Schedule of Property and Equipment, Net

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

	September 30, 2020			December 31, 2019
Prototype	$	16,901		$	16,419
Machinery and equipment		16,431			15,816
Leasehold improvements		6,857			6,718
Furniture and fixtures		1,295			1,284
Software		1,389			1,389
Construction in progress		6,117			4,176
Property and equipment, gross		48,990			45,802
Less: accumulated depreciation and amortization		(26,457	)		(22,403	)
Property and equipment, net	$	22,533		$	23,399

Schedule of Accrued Liabilities

Accrued liabilities consisted of the following (in thousands):

	September 30, 2020		December 31, 2019
Accrued payroll and related benefits	$	9,958	$	9,577
Accrued accounts payable		2,653		4,764
Payroll withholding tax, sales and other tax payable		1,460		1,066
Accrued legal, accounting and professional fees		825		1,175
Product upgrade reserve		2,534		3,794
Other		536		1,014
Total accrued liabilities	$	17,966	$	21,390

Schedule of Deferred Revenue

Deferred revenue consisted of the following (in thousands):

	September 30, 2020			December 31, 2019
Deferred revenue:
Product	$	14,329		$	3,141
Service		8,353			8,473
Distribution rights		2,040			2,396
Total deferred revenue		24,722			14,010
Less: current portion of deferred revenue		(21,838	)		(10,457	)
Noncurrent portion of deferred revenue	$	2,884		$	3,553

Schedule of Other Long Term Liabilities

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

	September 30, 2020		December 31, 2019
Accrued interest, noncurrent portion	$	904	$	516
Asset retirement obligation		923		861
Total other-long term liabilities	$	1,827	$	1,377