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Borrowings - Summary of Interest Expense Recognized (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Debt Disclosure [Abstract]
Contractual interest expense	$ 450	$ 450
Amortization of debt issuance costs	101	101
Accretion of debt discount	1,238	1,141
Net interest expense	$ 1,789	$ 1,692

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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