Balance Sheet Details (Tables)

12 Months Ended

Dec. 31, 2018

Balance Sheet Related Disclosures [Abstract]

Schedule of inventories

	December 31, 2018		December 31, 2017
Raw materials and purchased parts	$	11,267	$	8,259
Work-in-process	492		1,026
Finished goods	12,961		14,165
Consigned inventory	8,925		—
Total inventories	$	33,645	$	23,450

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,
	2018			2017
Beginning balance	$	1,315		$	910
Acquired liability from Nesscap	—			773
Product warranties issued	532			117
Settlement of warranties	(463		)	(693		)
Changes related to preexisting warranties	(440		)	208
Ending balance	$	944		$	1,315

Schedule of property, plant and equipment, net

	As of December 31,
	2018			2017
Machinery, furniture and office equipment	$	55,146		$	50,195
Leased equipment	1,911			—
Computer hardware and software	9,740			8,955
Leasehold improvements	18,990			17,742
Construction in progress	4,211			2,310
Property and equipment, gross	89,998			79,202
Less accumulated depreciation and amortization	(65,621		)	(59,242		)
Total property and equipment, net	$	24,377		$	19,960

Schedule of accounts payable and accrued liabilities

	As of December 31,
	2018		2017
Accounts payable	$	4,675	$	17,842
Income tax payable	348		415
Accrued warranty	944		1,315
Consigned inventory liability	7,078		—
Other accrued liabilities	3,468		7,711
Total accounts payable and accrued liabilities	$	16,513	$	27,283

Schedule of accumulated other comprehensive income

	Foreign Currency Translation Adjustment			Defined Benefit Plans			Accumulated Other Comprehensive Income (Loss)			Affected Line Items in the Statement of Operations
Balance as of December 31, 2017	$	12,957		$	(881	)	$	12,076
Other comprehensive income (loss) before reclassification	(1,694		)	—			(1,694		)
Amounts reclassified from accumulated other comprehensive income (loss)	—			(558		)	(558		)	Other components of defined benefit plans, net; and Income from discontinued operations, net of income taxes
Other comprehensive income (loss) recognized in connection with divestiture	(10,869		)	749			(10,120		)	Income from discontinued operations, net of income taxes
Total change in accumulated other comprehensive income (loss)	(12,563		)	191			(12,372		)
Balance as of December 31, 2018	$	394		$	(690	)	$	(296	)