Debt (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Less: debt - current, Principal	$ 0	$ (3,366)
Less: debt - current, Unamortized Discount	0	0
Less: debt-current	0	(3,366)	[1]
Debt - non-current, Principal	10,000	0
Debt - non-current, Unamortized Discount	140	0
Debt-non-current	9,860	0	[1]
Loan and Security Agreement
Debt Instrument [Line Items]
Total debt, Principal	10,000
Total debt, Unamortized amount	140
Total debt	9,860
Comerica - Revolving Line of Credit
Debt Instrument [Line Items]
Total debt, Principal		3,366
Total debt, Unamortized amount		0
Total debt		$ 3,366

[1] The financial information in this column was derived from audited financial statements included in the Company's 2013 Annual Report on Form 10-K.