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Organization - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Cash and cash equivalents	$ 38,749	$ 10,096	$ 8,352	$ 24,571
Accumulated deficit	$ (406,794)	$ (394,658)
Quarter to which operations can be funded with current cash and cash equivalents	Second quarter of 2015

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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