Balance Sheet Account Details (Tables)

12 Months Ended

Dec. 31, 2018

Balance Sheet Related Disclosures [Abstract]

Schedule of Other Current Assets

Prepaid expenses and other current assets

The following is a summary of prepaid expenses and other current assets (in thousands):

	December 31,
	2018		2017
Receivables under transition service agreements	$	15,507	$	7,509
Income taxes receivable	2,703		3,806
Prepaid expenses	4,508		2,898
Other	928		162
Total prepaid expenses and other current assets	$	23,646	$	14,375

Summary of Inventories

	December 31,
	2018		2017
Raw materials	$	24,292	$	22,252
Work-in-process (materials, labor and overhead)	21,280		22,813
Finished goods (materials, labor and overhead)	21,807		22,013
Total inventories	$	67,379	$	67,078

Property, Plant and Equipment

The following is a summary of property, plant and equipment (in thousands):

	December 31,
	2018			2017
Equipment, furniture and fixtures	$	89,285		$	75,728
Building and improvements	37,335			34,994
Leased instruments	42,647			32,458
Land	1,080			1,080
Total property, plant and equipment, gross	170,347			144,260
Less: accumulated depreciation and amortization	(96,446		)	(82,675		)
Total property, plant and equipment, net	$	73,901		$	61,585

Summary of Intangible Assets

Amortizable intangible assets consisted of the following (dollar amounts in thousands):

		December 31, 2018							December 31, 2017
Description	Weighted-average useful life (years)	Gross assets		Accumulated amortization			Net		Gross assets		Accumulated amortization			Net
Purchased technology	9.1	$	112,100	$	(57,495	)	$	54,605	$	112,100	$	(49,614	)	$	62,486
Customer relationships	7.0	122,389		(27,561		)	94,828		122,404		(10,960		)	111,444
License agreements	9.9	6,511		(4,530		)	1,981		6,515		(3,980		)	2,535
Patent and trademark costs	10.8	28,740		(7,624		)	21,116		28,740		(4,917		)	23,823
Software development costs	5.0	6,629		(4,130		)	2,499		6,630		(3,091		)	3,539
Total amortizable intangible assets		$	276,369	$	(101,340	)	$	175,029	$	276,389	$	(72,562	)	$	203,827

Summary of Expected Future Annual Amortization Expense

The expected future annual amortization expense of the Company’s intangible assets is as follows (in thousands):

For the years ending December 31,	Amortization expense
2019	$	27,542
2020	27,144
2021	26,999
2022	26,468
2023	25,758
Thereafter	41,118
Total	$	175,029

Schedule of Other Current Liabilities

The following is a summary of other current liabilities (in thousands):

	December 31,
	2018		2017
Customer incentives	$	7,516	$	7,165
Accrued interest	347		442
Other	5,129		5,059
Total other current liabilities	$	12,992	$	12,666