Discontinued Operations - Results from Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Product and service revenues	$ 2,663	$ 3,109	$ 5,123	$ 6,244
Total revenues	2,663	3,109	5,123	6,244
Cost of revenues	3,292	3,480	9,420	7,323
Research, development and other related costs	2,252	3,349	4,796	6,084
Selling, general and administrative	1,695	1,138	2,932	2,279
Restructuring, impairment of long-lived assets and other charges	544	0	4,646	0
Impairment of goodwill	0	0	6,664	0
Total operating expenses	7,783	7,967	28,458	15,686
Operating loss before taxes	(5,120)	(4,858)	(23,335)	(9,442)
Benefit from income taxes	(13,284)	(2,785)	(12,403)	(3,500)
Net income (loss) from discontinued operations	$ 8,164	$ (2,073)	$ (10,932)	$ (5,942)