Discontinued Operations - Summary of Financial Information Related to Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012		Sep. 30, 2013	Sep. 30, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Product sales	$ 68	$ 69	[1]	$ 156	$ 113	[1]
Cost of sales	1,930	2,321	[1]	6,523	5,968	[1]
Gross profit	(1,862)	(2,252)	[1]	(6,367)	(5,855)	[1]
Operating income	(13,121)	(5,310)	[1]	(24,839)	(16,743)	[1]
Net income (loss)	(12,937)	11,437	[1]	(24,981)	(1,639)	[1]
Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Product sales		142			516
Cost of sales		65			275
Gross profit		77			241
Operating income		20			27
Net income (loss)		$ 11			$ (2)

[1] Restated