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Summary of Preferred Stock Terms (Parenthetical) (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Series A Convertible Preferred Stock [Member]  
Preferred stock, liquidation Value per share $ 4.50us-gaap_PreferredStockLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
Series B Convertible Preferred Stock [Member]  
Preferred stock, liquidation Value per share $ 4.00us-gaap_PreferredStockLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
Preferred stock, frequency of dividend payment Quarterly
Preferred stock, dividend date of commencement Mar. 31, 2001
Series C Convertible Preferred Stock [Member]  
Preferred stock, liquidation Value per share $ 3.00us-gaap_PreferredStockLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
Preferred stock, frequency of dividend payment Quarterly
Preferred stock, dividend date of commencement Mar. 31, 2002
Series D Convertible Preferred Stock [Member]  
Preferred stock, liquidation Value per share $ 1,000us-gaap_PreferredStockLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
Preferred stock, frequency of dividend payment Quarterly
Preferred stock, dividend date of commencement Apr. 30, 2002
Series E Convertible Preferred Stock [Member]  
Preferred stock, liquidation Value per share $ 22.00us-gaap_PreferredStockLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
Preferred stock, frequency of dividend payment Quarterly
Preferred stock, dividend date of commencement May 31, 2002