Summary of Stock Options Outstanding (Detail) (USD $)	12 Months Ended
Dec. 31, 2012
Number of Shares
Outstanding at January 1, 2012	10,082,351
Granted	9,795,600
Exercised	(3,216)
Forfeit	(715,131)
Expired	(485,065)
Outstanding at December 31, 2012	18,674,539
Vested and expected to vest at December 31, 2012	17,546,663
Exercisable at December 31, 2012	7,199,768
Weighted Average Exercise Price per Share
Outstanding at January 1, 2012	$ 5.67
Granted	$ 1.81
Exercised	$ 2.86
Forfeit	$ 3.96
Expired	$ 15.17
Outstanding at December 31, 2012	$ 3.46
Vested and expected to vest at December 31, 2012	$ 3.53
Exercisable at December 31, 2012	$ 5.26
Aggregate Intrinsic Value
Outstanding at January 1, 2012	$ 168
Outstanding at December 31, 2012	4,867
Vested and expected to vest at December 31, 2012	4,867
Exercisable at December 31, 2012	$ 602

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