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Stockholder's Equity (Details 3) (USD $)	3 Months Ended		6 Months Ended
Stockholder's Equity (Details 3) (USD $)	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Summary of share-based compensation expense related to stock options, restricted stock and restricted stock units by expense category
share-based compensation expense	$ 2,710,000	$ 63,000	$ 2,710,000	$ 131,000
Research and development [Member]
Summary of share-based compensation expense related to stock options, restricted stock and restricted stock units by expense category
share-based compensation expense	248,000		248,000
General and administrative [Member]
Summary of share-based compensation expense related to stock options, restricted stock and restricted stock units by expense category
share-based compensation expense	$ 2,462,000	$ 63,000	$ 2,462,000	$ 131,000

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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