Balance Sheet Components

12 Months Ended

Dec. 31, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Balance Sheet Components

3. Balance Sheet Components

Property and Equipment, Net

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

	December 31,
	2019			2018
Prototype	$	16,419		$	12,425
Machine and equipment		15,816			12,654
Leasehold improvements		6,718			4,600
Furniture and fixtures		1,284			636
Software		1,389			1,250
Construction in progress		4,176			148
Property and equipment, gross		45,802			31,713
Less: accumulated depreciation and amortization		(22,403	)		(17,755	)
Property and equipment, net	$	23,399		$	13,958

Depreciation and amortization expense related to property and equipment was $4.7 million, $3.4 million and $2.2 million during the years ended December 31, 2019, 2018 and 2017, respectively.

Accrued Liabilities

Accrued liabilities consisted of the following (in thousands):

	December 31,
	2019		2018
Accrued payroll and related benefits	$	9,577	$	5,047
Accrued accounts payable		4,764		3,626
Payroll withholding tax, sales and other tax payable		1,066		782
Accrued legal and accounting		1,175		360
Product upgrade reserve		3,794		—
Other		1,014		168
Total accrued liabilities	$	21,390	$	9,983

Deferred Revenue

Deferred revenue consisted of the following (in thousands):

	December 31,
	2019			2018
Deferred revenue:
Product	$	3,141		$	9,623
Services		8,473			6,981
Distribution rights		2,396			2,871
Total deferred revenue		14,010			19,475
Less: current portion of deferred revenue		(10,457	)		(13,731	)
Noncurrent portion of deferred revenue	$	3,553		$	5,744

Other Long-Term Liabilities

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

	December 31,
	2019		2018
Accrued interest, noncurrent portion	$	516	$	—
Deferred rent, noncurrent portion		—		628
Other		861		192
Total other-long term liabilities	$	1,377	$	820