Balance Sheet Details (Tables)

12 Months Ended

Dec. 31, 2017

Balance Sheet Related Disclosures [Abstract]

Schedule of inventories

	December 31, 2017		December 31, 2016
Raw materials and purchased parts	$	12,675	$	12,210
Work-in-process	1,756		858
Finished goods	17,797		19,180
Total inventories	$	32,228	$	32,248

Schedule of product warranty liability

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

	Years Ended December 31,
	2017			2016
Beginning balance	$	1,213		$	1,288
Acquired liability from Nesscap	773			—
Product warranties issued	177			486
Settlement of warranties	(876		)	(458		)
Changes related to preexisting warranties	126			(103		)
Ending balance	$	1,413		$	1,213

Schedule of property, plant and equipment, net

	December 31,
	2017			2016
Machinery, furniture and office equipment	$	67,963		$	62,583
Computer hardware and software	10,436			10,071
Leasehold improvements	21,599			20,320
Construction in progress	5,461			1,401
Property and equipment, gross	105,459			94,375
Less accumulated depreciation and amortization	(77,415		)	(68,255		)
Total property and equipment, net	$	28,044		$	26,120

Schedule of accounts payable and accrued liabilities

	December 31,
	2017		2016
Accounts payable	$	21,242	$	13,109
Income tax payable	1,737		1,066
Accrued warranty	1,413		1,213
Other accrued liabilities	8,366		3,793
Total accounts payable and accrued liabilities	$	32,758	$	19,181

Schedule of accumulated other comprehensive income

	Foreign Currency Translation Adjustment		Pension and Defined Benefit Plan			Accumulated Other Comprehensive Income		Affected Line Items in the Statement of Operations
Balance as of December 31, 2016	$	7,826	$	(2,426	)	$	5,400
Other comprehensive income before reclassification	5,131		—			5,131
Amounts reclassified from accumulated other comprehensive income (loss)	—		1,545			1,545		Cost of Sales, Selling, General and Administrative and Research and Development Expense
Net other comprehensive income	5,131		1,545			6,676
Balance as of December 31, 2017	$	12,957	$	(881	)	$	12,076