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Summary of Warrants and Related Information (Detail) (Warrant, USD $)
3 Months Ended
Mar. 31, 2015
Warrant
 
Warrants  
Beginning balance 20,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
Granted 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
Canceled 0icon_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCancelledInPeriod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
Exercised 0icon_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
Expired/Forfeited 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
Ending balance 20,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
Exercisable at March 31, 2015 20,000icon_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableNumber
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
Weighted-Average Exercise Price  
Beginning balance $ 6.64icon_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
Granted $ 0icon_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
Canceled $ 0icon_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCanceledInPeriodWeightedAverageExercisePrice
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
Exercised $ 0icon_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
Expired/Forfeited $ 0icon_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresInPeriodWeightedAverageExercisePrice
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
Ending balance $ 6.64icon_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
Exercisable at March 31, 2015 $ 6.64icon_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember