Schedule of Other Income Expense Net (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Component of Other Expense, Nonoperating [Abstract]
Unrealized gain on change in fair value of warrant liability	$ 752	$ 3,792	$ 1,497	$ 3,792
Foreign currency transaction gains (losses)	259	(273)	40	(257)
Other non-operating expenses	(17)	(6)	(37)	(22)
Total other income, net	$ 994	$ 3,513	$ 1,500	$ 3,513