Debt - Schedule of Debt (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Debt	$ 12,438	$ 16,338
Less current portion	(177)	(8,572)
Debt, less current portion	12,261	7,766
Promissory note bearing interest at 6.25% [Member]
Debt Instrument [Line Items]
Debt		35
Term Loan bearing interest at 7.00% [Member]
Debt Instrument [Line Items]
Debt	339	426
Promissory note bearing interest at 7.00% [Member]
Debt Instrument [Line Items]
Debt	158	261
April 2012 Senior secured promissory note [Member]
Debt Instrument [Line Items]
Debt		8,374
October 2012 Junior secured promissory notes [Member]
Debt Instrument [Line Items]
Debt	$ 11,941	$ 7,242