Balance Sheet Account Detail (Tables)

12 Months Ended

Dec. 31, 2016

Balance Sheet Related Disclosures [Abstract]

Schedule of Property and Equipment

Property and equipment consisted of the following:

	December 31,
	2016			2015
Production equipment, molds, and office furniture	$	11,714		$	13,603
Computer hardware and software	8,162			6,380
Leasehold improvements	15,495			14,345
Construction in progress (software and related implementation, production equipment, and leasehold improvements)	839			510
Property and equipment, at cost	36,210			34,838
Accumulated depreciation	(12,945		)	(11,483		)
Property and equipment, net	$	23,265		$	23,355

Schedule of Inventories

Inventories consisted of the following:

	December 31,
	2016		2015
Raw materials	$	13,133	$	7,701
Work-in-process	10,139		4,355
Finished goods	17,888		15,804
Inventories	$	41,160	$	27,860

Schedule of Goodwill and Intangible Assets

The following table presents goodwill, indefinite lived intangible assets, finite lived intangible assets, and related accumulated amortization:

	December 31,
	2016			2015
Goodwill (1)	$	120,711		$	28,685
Intangible assets:
Indefinite lived intangibles
Trademarks and trade names	$	2,708		$	2,708
In-process research and development (1)	11,200			—
Finite lived intangibles
Developed technology (1)	$	67,600		$	40,100
Accumulated amortization	(3,810		)	(690		)
Developed technology, net	$	63,790		$	39,410
Customer relationship (1)	$	7,500		$	—
Accumulated amortization	(687		)	—
Customer relationship, net	$	6,813		$	—
Intangible assets (excluding goodwill), net	$	84,511		$	42,118

(1) Difference in the value between these dates is mainly due to acquisition of TriVascular. Refer to Note 13 of the consolidated financial statements for further discussion.

Schedule of Estimated Amortization Expense

Estimated amortization expense for the five succeeding years and thereafter is as follows:

	Amortization Expense
2017	$	3,818
2018	4,574
2019	6,036
2020	7,677
2021	8,917
2022 and thereafter	39,581
Total	$	70,603

Schedule of Investments in Held-to-maturity Marketable Securities

Investments in held-to-maturity marketable securities, consist of the following at December 31, 2016 and December 31, 2015:

	December 31, 2016
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
Agency bonds	$	6,488	$	2	$	—		$	6,490
Corporate bonds	10,513		—		(21		)	$	10,492
Commercial paper	3,987		—		—			3,987
Total	$	20,988	$	2	$	(21	)	$	20,969

	December 31, 2015
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
Agency bonds	$	8,000	$	—	$	(20	)	$	7,980
Government securities	40,824		1		(33		)	$	40,792
Commercial paper	3,944		—		—			$	3,944
Total	$	52,768	$	1	$	(53	)	$	52,716

Summary of Assets and Liabilities Measured at Fair Value

The following fair value hierarchy table presents information about each major category of the Company’s assets and liabilities measured at fair value on a recurring basis as of December 31, 2016:

	Fair value measurement at reporting date using:
	Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)		Total
At December 31, 2016
Cash and cash equivalents	$	26,120	$	—	$	—	$	26,120
Restricted cash	$	2,001	$	—	$	—	$	2,001
Contingently issuable common stock	$	—	$	—	$	12,200	$	12,200
At December 31, 2015
Cash and cash equivalents	$	124,553	$	—	$	—	$	124,553
Contingently issuable common stock	$	—	$	—	$	14,700	$	14,700