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Balance Sheet Components (Tables)

12 Months Ended

Dec. 31, 2018

Balance Sheet Related Disclosures [Abstract]

Schedule of Inventories

Inventories consist of the following (in thousands):

	December 31,
	2018				2017
Raw materials	$	26,119			$	12,721
Work in process	13,784				12,157
Finished goods	15,738				6,810
Total inventories	$	55,641			$	31,688

Schedule of Other Assets

Other assets consist of the following (in thousands):

	December 31,
	2018				2017
Capitalized commissions 1	$	9,185			$	5,514
Equity securities	9,862				—
Security deposits	5,162				3,557
Loan receivable from equity investee	—				30,000
Other long-term assets	2,778				4,822
Total other assets	$	26,987			$	43,893

Property, Plant and Equipment

Property, plant and equipment consist of the following (in thousands):

			December 31,
	Generally Used Estimated Useful Life		2018				2017
Clinical and manufacturing equipment	Up to 10 years		$	236,179			$	183,392
Computer hardware	3 years		34,297				24,933
Computer software	3 years		59,617				54,756
Furniture and fixtures	5 years		33,436				16,271
Leasehold improvements	Lease term (1)		77,168				37,756
Building	20 years		139,315				63,887
Land	—		17,630				17,630
CIP	—		95,414				85,976
Total			693,056				484,601
Less: Accumulated depreciation and amortization and impairment charges			(171,727		)		(135,808		)
Total property, plant and equipment, net			$	521,329			$	348,793

⁽¹⁾ Shorter of remaining lease term or estimated useful lives of asset

Schedule of Accrued Liabilities

Accrued liabilities consist of the following (in thousands):

	December 31,
	2018				2017
Accrued payroll and benefits	$	127,109			$	103,004
Accrued expenses	39,323				27,318
Accrued customer credits and deposits	12,439				5,373
Accrued warranty	8,551				5,929
Accrued property, plant and equipment	8,193				11,362
Accrued professional fees	6,752				6,316
Accrued sales return reserve 1	6,534				1,364
Accrued sales tax and value added tax	6,276				5,503
Accrued income taxes	5,752				12,405
Accrued sales rebate	5,668				11,209
Other accrued liabilities	8,082				5,779
Total accrued liabilities	$	234,679			$	195,562

Warranty accrual

Warranty as of December 31, 2018 and 2017 consists of the following activity (in thousands):

Accrued warranty as of December 31, 2016	$	3,841
Charged to cost of net revenues	7,195
Actual warranty expenditures	(5,107		)
Accrued warranty as of December 31, 2017	5,929
Charged to cost of net revenues	15,059
Actual warranty expenditures	(12,437		)
Accrued warranty as of December 31, 2018	$	8,551

Deferred Revenue, by Arrangement, Disclosure

Deferred revenues consist of the following (in thousands):

	December 31,
	2018				2017
Deferred revenues - current	$	393,138			$	267,713
Deferred revenues - long-term 1	17,051				4,588

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