Schedule of Other Income Expense Net (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
Component of Other Expense, Nonoperating [Abstract]
Unrealized gain (loss) on change in fair value of warrant liability	$ (196)	$ (6,577)	$ 1,301	$ (2,785)
Foreign currency transaction gains (losses)	455	139	495	(118)
Other non-operating expenses	(19)	30	(56)	8
Total other income (expense), net	$ 240	$ (6,408)	$ 1,740	$ (2,895)