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Debt - Principal and Interest Payments on Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Debt Instrument [Line Items]  
2015 $ 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear [1]
2016 2,614us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo [1]
2017 2,802us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree [1]
2018 3,003us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour [1]
2019 1,581us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive [1]
Total 10,000us-gaap_LongTermDebt [1]
2015 522cers_LongTermDebtMaturitiesRepaymentsOfInterestRemainderOfFiscalYear [1]
2016 613cers_LongTermDebtMaturitiesRepaymentsOfInterestInYearTwo [1]
2017 425cers_LongTermDebtMaturitiesRepaymentsOfInterestInYearThree [1]
2018 224cers_LongTermDebtMaturitiesRepaymentsOfInterestInYearFour [1]
2019 733cers_LongTermDebtMaturitiesRepaymentsOfInterestInYearFive [1]
Total 2,517cers_LongTermDebtMaturitiesRepaymentsOfInterest [1]
2015 522cers_LongTermDebtMaturitiesRepaymentsOfPrincipalAndInterestRemainderOfFiscalYear [1]
2016 3,227cers_LongTermDebtMaturitiesRepaymentsOfPrincipalAndInterestInYearTwo [1]
2017 3,227cers_LongTermDebtMaturitiesRepaymentsOfPrincipalAndInterestInYearThree [1]
2018 3,227cers_LongTermDebtMaturitiesRepaymentsOfPrincipalAndInterestInYearFour [1]
2019 2,314cers_LongTermDebtMaturitiesRepaymentsOfPrincipalAndInterestInYearFive [1]
Total $ 12,517cers_LongTermDebtMaturitiesRepaymentsOfPrincipalAndInterest [1]
[1] Unless interest only period extends to December 31, 2016, as described below.