Balance Sheet Details (Tables)

6 Months Ended

Jun. 30, 2018

Balance Sheet Related Disclosures [Abstract]

Schedule of inventories

	June 30, 2018		December 31, 2017
Raw materials and purchased parts	$	14,989	$	12,675
Work-in-process	2,490		1,756
Finished goods	24,158		17,797
Total inventories	$	41,637	$	32,228

Schedule of activity in the warranty reserve

Activity in the warranty reserve, which is included in “accounts payable and accrued liabilities” in the condensed consolidated balance sheets, is as follows:

	Six Months Ended June 30,
	2018			2017
Beginning balance	$	1,413		$	1,213
Acquired liability from Nesscap	—			773
Product warranties issued	357			270
Settlement of warranties	(445		)	(181		)
Changes related to preexisting warranties	(197		)	(61		)
Ending balance	$	1,128		$	2,014

Schedule of accumulated other comprehensive income

	Foreign Currency Translation Adjustment			Defined Benefit Pension Plan			Accumulated Other Comprehensive Income			Affected Line Items in the Statement of Operations
Balance as of December 31, 2017	$	12,957		$	(881	)	$	12,076
Other comprehensive income before reclassification	(1,967		)	—			(1,967		)
Amounts reclassified from accumulated other comprehensive income	—			38			38			Cost of Sales, Selling, General and Administrative and Research and Development Expense
Net other comprehensive income for the six months ended June 30, 2018	(1,967		)	38			(1,929		)
Balance as of June 30, 2018	$	10,990		$	(843	)	$	10,147