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Customer Concentrations and Accounts Receivable (Details) (USD $)
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3 Months Ended |
9 Months Ended |
12 Months Ended |
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2014
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Dec. 31, 2013
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Mar. 31, 2014
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| Customer Concentrations and Accounts Receivable |
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| Bad debt expense |
$ 43,000us-gaap_ProvisionForDoubtfulAccounts
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$ 100,000us-gaap_ProvisionForDoubtfulAccounts
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$ 3,101,000us-gaap_ProvisionForDoubtfulAccounts
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$ 193,000us-gaap_ProvisionForDoubtfulAccounts
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| Revenue | Customer concentrations | Horizon |
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| Customer Concentrations and Accounts Receivable |
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| Concentration percentage |
17.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= cpst_HorizonPowerSystemsMember
|
16.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= cpst_HorizonPowerSystemsMember
|
20.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= cpst_HorizonPowerSystemsMember
|
13.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= cpst_HorizonPowerSystemsMember
|
|
| Revenue | Customer concentrations | DTC |
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|
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| Customer Concentrations and Accounts Receivable |
|
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| Concentration percentage |
12.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= cpst_DTCSolucionesInmobiliariasMember
|
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| Revenue | Customer concentrations | Optimal Group |
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| Customer Concentrations and Accounts Receivable |
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| Concentration percentage |
11.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= cpst_OptimalGroupMember
|
|
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| Revenue | Customer concentrations | E-Finity |
|
|
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| Customer Concentrations and Accounts Receivable |
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|
|
|
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| Concentration percentage |
|
18.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= cpst_EFinityDistributedGenerationMember
|
10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= cpst_EFinityDistributedGenerationMember
|
21.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= cpst_EFinityDistributedGenerationMember
|
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| Revenue | Customer concentrations | Regatta |
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| Customer Concentrations and Accounts Receivable |
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| Concentration percentage |
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11.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= cpst_RegattaSolutionsIncMember
|
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| Revenue | Customer concentrations | BPC |
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| Customer Concentrations and Accounts Receivable |
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| Concentration percentage |
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15.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= cpst_BPCEngineeringMember
|
14.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= cpst_BPCEngineeringMember
|
|
| Net accounts receivable | Credit concentration | DTC |
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| Customer Concentrations and Accounts Receivable |
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| Concentration percentage |
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|
15.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= cpst_DTCSolucionesInmobiliariasMember
|
|
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| Net accounts receivable | Credit concentration | E-Finity |
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|
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| Customer Concentrations and Accounts Receivable |
|
|
|
|
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| Concentration percentage |
|
|
|
|
16.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= cpst_EFinityDistributedGenerationMember
|
| Net accounts receivable | Credit concentration | BPC |
|
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| Customer Concentrations and Accounts Receivable |
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| Concentration percentage |
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38.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= cpst_BPCEngineeringMember
|
|
26.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= cpst_BPCEngineeringMember
|
| Net accounts receivable | Credit concentration | EMI |
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| Customer Concentrations and Accounts Receivable |
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| Concentration percentage |
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18.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= cpst_ElectroMecaniqueIndustriesMember
|