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Accrued Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Schedule of Accrued Liabilities [Line Items]    
Accrued compensation and related costs $ 2,418us-gaap_EmployeeRelatedLiabilitiesCurrent $ 3,951us-gaap_EmployeeRelatedLiabilitiesCurrent
Accrued professional services 3,364us-gaap_AccruedProfessionalFeesCurrent 2,123us-gaap_AccruedProfessionalFeesCurrent
Accrued inventory costs 11cers_AccruedInventory 870cers_AccruedInventory
Accrued customer costs and deposits 508cers_AccruedCustomerCostsAndDepositsCurrent 385cers_AccruedCustomerCostsAndDepositsCurrent
Accrued insurance premiums 142us-gaap_AccruedInsuranceCurrent 264us-gaap_AccruedInsuranceCurrent
Other accrued expenses 661us-gaap_OtherAccruedLiabilitiesCurrent 851us-gaap_OtherAccruedLiabilitiesCurrent
Total accrued liabilities $ 7,104us-gaap_AccruedLiabilitiesCurrent $ 8,444us-gaap_AccruedLiabilitiesCurrent [1]
[1] The financial information in this column was derived from audited financial statements included in the Company's 2014 Annual Report on Form 10-K.