Annual report pursuant to Section 13 and 15(d)

Deferred Revenue (Details)

v2.4.1.9
Deferred Revenue (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Changes in deferred revenue      
Deferred revenue balance, end of the period $ 3,051us-gaap_DeferredRevenueCurrent $ 2,657us-gaap_DeferredRevenueCurrent  
FPP agreements      
Changes in deferred revenue      
FPP Balance, beginning of the period 2,061cpst_DeferredRevenueCurrentExcludingDeposits
/ us-gaap_DeferredRevenueArrangementTypeAxis
= cpst_FactoryProtectionPlanAgreementsMember
1,412cpst_DeferredRevenueCurrentExcludingDeposits
/ us-gaap_DeferredRevenueArrangementTypeAxis
= cpst_FactoryProtectionPlanAgreementsMember
1,167cpst_DeferredRevenueCurrentExcludingDeposits
/ us-gaap_DeferredRevenueArrangementTypeAxis
= cpst_FactoryProtectionPlanAgreementsMember
FPP Billings 9,773us-gaap_DeferredRevenueAdditions
/ us-gaap_DeferredRevenueArrangementTypeAxis
= cpst_FactoryProtectionPlanAgreementsMember
7,689us-gaap_DeferredRevenueAdditions
/ us-gaap_DeferredRevenueArrangementTypeAxis
= cpst_FactoryProtectionPlanAgreementsMember
5,884us-gaap_DeferredRevenueAdditions
/ us-gaap_DeferredRevenueArrangementTypeAxis
= cpst_FactoryProtectionPlanAgreementsMember
FPP Revenue recognized (9,343)us-gaap_DeferredRevenueRevenueRecognized
/ us-gaap_DeferredRevenueArrangementTypeAxis
= cpst_FactoryProtectionPlanAgreementsMember
(7,040)us-gaap_DeferredRevenueRevenueRecognized
/ us-gaap_DeferredRevenueArrangementTypeAxis
= cpst_FactoryProtectionPlanAgreementsMember
(5,639)us-gaap_DeferredRevenueRevenueRecognized
/ us-gaap_DeferredRevenueArrangementTypeAxis
= cpst_FactoryProtectionPlanAgreementsMember
Balance attributed to FPP contracts 2,491cpst_DeferredRevenueCurrentExcludingDeposits
/ us-gaap_DeferredRevenueArrangementTypeAxis
= cpst_FactoryProtectionPlanAgreementsMember
2,061cpst_DeferredRevenueCurrentExcludingDeposits
/ us-gaap_DeferredRevenueArrangementTypeAxis
= cpst_FactoryProtectionPlanAgreementsMember
1,412cpst_DeferredRevenueCurrentExcludingDeposits
/ us-gaap_DeferredRevenueArrangementTypeAxis
= cpst_FactoryProtectionPlanAgreementsMember
Deposits 560us-gaap_DepositLiabilityCurrent
/ us-gaap_DeferredRevenueArrangementTypeAxis
= cpst_FactoryProtectionPlanAgreementsMember
596us-gaap_DepositLiabilityCurrent
/ us-gaap_DeferredRevenueArrangementTypeAxis
= cpst_FactoryProtectionPlanAgreementsMember
1,677us-gaap_DepositLiabilityCurrent
/ us-gaap_DeferredRevenueArrangementTypeAxis
= cpst_FactoryProtectionPlanAgreementsMember
Deferred revenue balance, end of the period $ 3,051us-gaap_DeferredRevenueCurrent
/ us-gaap_DeferredRevenueArrangementTypeAxis
= cpst_FactoryProtectionPlanAgreementsMember
$ 2,657us-gaap_DeferredRevenueCurrent
/ us-gaap_DeferredRevenueArrangementTypeAxis
= cpst_FactoryProtectionPlanAgreementsMember
$ 3,089us-gaap_DeferredRevenueCurrent
/ us-gaap_DeferredRevenueArrangementTypeAxis
= cpst_FactoryProtectionPlanAgreementsMember