Summary of Amortization Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014
Product Revenues
Business Acquisition [Line Items]
Amortization	$ (116)	$ (116)
Amortization expense	116	116
Selling, General and Administrative Expense
Business Acquisition [Line Items]
Amortization	(533)	(533)
Amortization expense	$ 533	$ 533