Reconciliation of Financial Instruments Recognized at Fair Value (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2015 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Balance of embedded conversion derivative liability	$ 760
gain on fair value adjustments to embedded conversion derivative liability	(55)
Balance of embedded conversion derivative liability	$ 705