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Balance Sheet Details (Tables)

12 Months Ended

Dec. 31, 2018

Condensed Financial Information Disclosure [Abstract]

Short Term Marketable Securities

Short-Term Marketable Securities

Short-term marketable securities, consisting of equity securities and debt securities, were as follows as of the dates indicated:

	December 31, 2018
(In millions)	Cost or Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Estimated Market Value
Equity investment in Tandem Diabetes Care, Inc	$	2.0			$	36.0			$	—			$	38.0
Debt securities, available for sale:
U.S. government agencies	173.2				—				(0.1		)		173.1
Commercial paper	36.2				—				—				36.2
Corporate debt	1.3				—				—				1.3
Total debt securities, available for sale	210.7				—				(0.1		)		210.6
Total marketable securities	$	212.7			$	36.0			$	(0.1	)		$	248.6

	December 31, 2017
(In millions)	Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Estimated Market Value
Debt securities, available for sale:
U.S. government agencies	$	87.5			$	—			$	(0.2	)		$	87.3
Commercial paper	14.7				—				—				14.7
Corporate debt	5.1				—				—				5.1
Total debt securities, available for sale	$	107.3			$	—			$	(0.2	)		$	107.1

Reconciliation of net gain realized and unrealized gain recognized on equity securities

The following table reconciles the net gain recognized on equity securities during the twelve months ended December 31, 2018, 2017 and 2016 to the unrealized gain recognized during those periods on equity securities still held at the reporting dates.

	Twelve Months Ended   December 31,
(In millions)	2018				2017				2016
Net gains recognized during the period on equity securities	$	80.1			$	—			$	—
Less: Net gains recognized during the period on equity securities sold during the period	(44.1		)		—				—
Unrealized gains recognized during the reporting period on equity securities still held at the reporting date	$	36.0			$	—			$	—

Accounts Receivable

Accounts Receivable

	December 31,
(In millions)	2018				2017
Accounts receivable	$	233.9			$	145.8
Less allowance for doubtful accounts	(7.2		)		(11.5		)
Total accounts receivable, net	$	226.7			$	134.3

Inventory

Inventory

	December 31,
(In millions)	2018				2017
Raw materials	$	30.8			$	20.0
Work-in-process	11.2				8.2
Finished goods	28.7				17.0
Total inventory	$	70.7			$	45.2

Property and Equipment

Property and Equipment

	December 31,
(In millions)	2018				2017
Building (1)	$	6.0			$	6.0
Furniture and fixtures	9.0				5.7
Computer software and hardware	29.2				25.6
Machinery and equipment	80.7				33.8
Leasehold improvements	80.7				41.7
Construction in progress (2)	57.3				87.6
Total cost	262.9				200.4
Less accumulated depreciation and amortization	(79.8		)		(54.8		)
Total property and equipment, net	$	183.1			$	145.6

⁽¹⁾ As described in Note 6, “Commitments,” although we do not legally own these premises, we were deemed the owner of the construction project during the construction period of our manufacturing facility in Mesa, Arizona under a build-to suit lease arrangement. We placed the facility into service in 2018 and as of December 31, 2018 had recorded accumulated amortization of $0.7 million.

⁽²⁾ Construction in progress as of December 31, 2018 and December 31, 2017 included approximately $6.2 million and $33.6 million, respectively, related to our manufacturing facility in Mesa, Arizona with the remaining balances as of those dates primarily related to machinery and equipment.

Accounts Payable and Accrued Liabilities

Accounts Payable and Accrued Liabilities

	December 31,
(In millions)	2018				2017
Accounts payable trade	$	75.5			$	46.7
Accrued tax, audit, and legal fees	11.7				7.1
Accrued rebates	36.1				13.9
Accrued warranty	6.8				8.8
Accrued other	17.0				10.7
Total accounts payable and accrued liabilities	$	147.1			$	87.2

Accrued Warranty

Accrued Warranty

Warranty costs are reflected in our statements of operations as cost of product sales. Reconciliations of our accrued warranty costs for the twelve months ended December 31, 2018 and 2017 were as follows:

	Twelve Months Ended December 31,
(In millions)	2018				2017
Beginning balance	$	8.8			$	9.8
Charges to costs and expenses	17.4				18.4
Costs incurred	(19.4		)		(19.4		)
Ending balance	$	6.8			$	8.8

Schedule of Other Assets and Other Liabilities

Other Liabilities

	December 31,
(In millions)	2018				2017
Financing lease obligations	$	7.3			$	6.7
Deferred rent	9.4				8.7
Other	3.3				2.8
Total other liabilities	$	20.0			$	18.2

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