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Debt and Senior Secured Convertible Notes - Schedule of Debt (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2013
Debt Instrument [Line Items]
Total debt	$ 4,000us-gaap_LongTermDebt	$ 4,000us-gaap_LongTermDebt
Less current portion	(4,000)us-gaap_LongTermDebtCurrent	(4,000)us-gaap_LongTermDebtCurrent
Long-term debt	0us-gaap_LongTermDebtNoncurrent	0us-gaap_LongTermDebtNoncurrent
Working Capital Revolving Line of Credit [Member]
Debt Instrument [Line Items]
Total debt	$ 4,000	$ 4,000

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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