Balance Sheet Account Detail Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Goodwill, Finite-lived, and Indefinite-lived Intangible Assets [Line Items]
Goodwill	$ 28,963		$ 29,022
Indefinite lived intangibles	2,708		42,808
Intangible assets (excluding goodwill), net	43,278		43,356
Developed technology
Goodwill, Finite-lived, and Indefinite-lived Intangible Assets [Line Items]
Finite lived intangibles	40,100	[1]	0	[1]
Accumulated amortization	(10)		0
Finite lived intangibles, net	40,090		0
Patent
Goodwill, Finite-lived, and Indefinite-lived Intangible Assets [Line Items]
Finite lived intangibles	100		100
Accumulated amortization	(80)		(75)
Finite lived intangibles, net	20		25
License
Goodwill, Finite-lived, and Indefinite-lived Intangible Assets [Line Items]
Finite lived intangibles	100		100
Accumulated amortization	(20)		(12)
Finite lived intangibles, net	80		88
Customer list
Goodwill, Finite-lived, and Indefinite-lived Intangible Assets [Line Items]
Finite lived intangibles	506		522
Accumulated amortization	(126)		(87)
Finite lived intangibles, net	380		435
In-process research and development
Goodwill, Finite-lived, and Indefinite-lived Intangible Assets [Line Items]
Indefinite lived intangibles	0	[1]	40,100	[1]
Trademarks and trade names
Goodwill, Finite-lived, and Indefinite-lived Intangible Assets [Line Items]
Indefinite lived intangibles	$ 2,708		$ 2,708

[1] Was reclassified in the first quarter of 2013 to finite lived intangibles, which coincided with the commercial launch of the product (Nellix System) associated with this intangible asset.