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Long-Term Debt - Schedule of Long-Term Debt (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Total long-term debt	$ 6,357	$ 12,071
Current portion of long-term debt	5,714	5,714
Long-term debt, less current portion	643	6,357
Series A Term Note [Member]
Debt Instrument [Line Items]
Total long-term debt	2,143	4,286
Series B Term Note [Member]
Debt Instrument [Line Items]
Total long-term debt	1,500	3,000
Series C Term Note [Member]
Debt Instrument [Line Items]
Total long-term debt	1,429	2,857
Series D Term Note [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 1,285	$ 1,928

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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