Financial Statement Details (Tables)

12 Months Ended

Dec. 31, 2013

Disclosure of Financial Statement Details [Abstract]

Short Term Marketable Securities, Available for Sale

Short term marketable securities, consisting solely of debt securities with contractual maturities of less than one year were as follows:

	December 31, 2013
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Market Value
U.S. government agencies	$	8.9	$	—	$	—	$	8.9
Corporate debt	2.5		—		—		2.5
Total	$	11.4	$	—	$	—	$	11.4

	December 31, 2012
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Market Value
U.S. government agencies	$	31.8	$	—	$	—	$	31.8
Corporate debt	8.0		—		—		8.0
Commercial paper	0.8		—		—		0.8
Total	$	40.6	$	—	$	—	$	40.6

Accounts Receivable

Accounts Receivable

	December 31,
	2013			2012
Accounts receivable	$	28.8		$	20.7
Less allowance for doubtful accounts, sales returns and discounts	(2.7		)	(1.2		)
Total	$	26.1		$	19.5

Inventory

Inventory

	December 31,
	2013		2012
Raw materials	$	4.8	$	2.5
Work-in-process	0.3		0.4
Finished goods	3.9		4.5
Total	$	9.0	$	7.4

Property and Equipment

Property and Equipment

	December 31,
	2013			2012
Furniture and fixtures	$	2.6		$	2.5
Computer equipment	15.2			12.0
Machinery and equipment	19.0			16.2
Leasehold improvements	10.5			9.3
Total	47.3			40.0
Accumulated depreciation and amortization	(26.6		)	(21.1		)
Property and equipment, net	$	20.7		$	18.9

Schedule of Intangible Assets and Goodwill

Goodwill and Intangible Assets

Goodwill and intangible assets as of December 31, 2013 consisted of the following (in millions, except months):

	Weighted-Average Amortization Period (in months)	Gross Amount		Accumulated Amortization			Intangible Assets, net
Intangible assets subject to amortization
Developed technology	109	$	3.2	$	(0.7	)	$	2.5
Customer-related intangible	70	0.6		(0.2		)	0.4
Covenants not-to-compete	70	0.6		(0.2		)	0.4
Total		$	4.4	$	(1.1	)	$	3.3
Intangible assets not subject to amortization
In-process research and development							0.2
Trademarks and trade names							0.1
Goodwill							3.2
Total							$	3.5

Goodwill and intangible assets as of December 31, 2012 consisted of the following (in millions, except months):

	Weighted-Average Amortization Period (in months)	Gross Amount		Accumulated Amortization			Intangible Assets, net
Intangible assets subject to amortization
Developed technology	109	$	3.2	$	(0.3	)	$	2.9
Customer-related intangible	70	0.6		(0.1		)	0.5
Covenants not-to-compete	70	0.6		(0.1		)	0.5
Total		$	4.4	$	(0.5	)	$	3.9
Intangible assets not subject to amortization
In-process research and development							0.2
Trademarks and trade names							0.1
Goodwill							3.2
Total							$	3.5

Schedule of Estimated Future Amortization Expense

The following table sets forth the total future amortization expense related to intangible assets subject to amortization as of December 31, 2013:

Fiscal Year Ending
2014	$	0.6
2015	0.7
2016	0.5
2017	0.5
2018	0.3
Thereafter through 2021	0.9
Total	$	3.5

Accounts Payable and Accrued Liabilities

Accounts Payable and Accrued Liabilities

	December 31,
	2013		2012
Accounts payable trade	$	4.2	$	3.9
Accrued tax, audit, and legal fees	1.2		0.7
Clinical trials	0.3		0.1
Accrued other including warranty	4.8		2.8
Acquisition-related liabilities	3.6		1.2
Total	$	14.1	$	8.7

Accrued Payroll And Related Expenses

Accrued Payroll and Related Expenses

	December 31,
	2013		2012
Accrued paid time off	$	2.7	$	2.3
Accrued wages, bonus and taxes	11.3		6.1
Other accrued employee benefits	1.1		0.8
Total	$	15.1	$	9.2

Accrued Warranty

Accrued Warranty

	Years Ended December 31,
	2013			2012
Beginning balance	$	0.3		$	0.3
Charges to costs and expenses	4.1			1.9
Costs incurred	(3.5		)	(1.9		)
Ending balance	$	0.9		$	0.3