Condensed Consolidated Financial Statement Details (Tables)

6 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Inventories

Inventory

	June 30, 2018		December 31, 2017
Raw materials	$	2,820	$	4,534
Work-in-process	2,861		3,638
Finished goods	3,147		2,777
Total inventories	$	8,828	$	10,949

Property and equipment, net

Property, equipment and leasehold improvements are recorded at cost and depreciated using the straight-line method over the estimated useful lives of the assets, which are identified below. Repair and maintenance costs are expensed as incurred.

Machinery and laboratory equipment	3 - 5 years
Instruments	4 - 5 years
Office equipment	3 - 7 years
Leasehold improvements	over the shorter of the remaining life of the lease or the useful economic life of the asset

Property and Equipment, Net

	June 30, 2018			December 31, 2017
Property and equipment — at cost:
Machinery and laboratory equipment	$	14,040		$	13,762
Instruments	14,218			13,347
Office equipment	2,102			1,948
Leasehold improvements	10,500			10,480
Total property and equipment — at cost	40,860			39,537
Less: accumulated depreciation	(19,701		)	(16,956		)
Property and equipment, net	$	21,159		$	22,581

Accrued warranty

Accrued Warranty

The following table shows changes in the Company's accrued warranties for the three and six months ended June 30, 2018 and 2017 (in thousands):

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
Beginning accrued warranty balance	$	418		$	304		$	470		$	219
Warranty expenses incurred	(559		)	(237		)	(1,075		)	(549		)
Provisions	580			186			1,044			583
Ending accrued warranty balance	$	439		$	253		$	439		$	253