Balance Sheet Components

9 Months Ended

Sep. 30, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Inventory

As of September 30, 2019 and December 31, 2018, inventory consisted entirely of finished goods.

Property and Equipment, net:



	September 30, 2019			December 31, 2018
	(in thousands)
Machinery and equipment	$	4,175		$	3,785
Construction in progress	1,297			730
Computer and office equipment	561			407
Leasehold improvements	497			448
Furniture and fixtures	154			148
	6,684			5,518
Less: Accumulated depreciation and amortization	(3,659		)	(3,364		)
	$	3,025		$	2,154

Depreciation expense was $0.2 million and $0.2 million for the three months ended September 30, 2019 and 2018, respectively and $0.6 million and $0.5 million for the nine months ended September 30, 2019 and 2018, respectively.

Accrued Liabilities and Other:



	September 30, 2019		December 31, 2018
	(in thousands)
Accrued compensation and related expenses	$	6,097	$	5,425
Accrued litigation expense	2,500		—
Accrued professional services	730		583
Sales tax payable	346		388
Liability for early exercise of unvested stock options	133		331
Others	405		133
	$	10,211	$	6,860