Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Details 2)

v2.4.1.9
Stockholders' Equity (Details 2)
12 Months Ended
Mar. 31, 2015
Stock options  
Stockholders' equity  
Portion vesting one year after the issuance date (as a percent) 25.00%cpst_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsPercentageOneYearAfterIssuance
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Portion vesting on first day of each month after one year from the issuance date (as a percent) 2.083%cpst_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsPercentageVestingOnFirstDayOfEachMonthAfterOneYearOfIssuanceDate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Vesting period of awards after issuance date 1 year
Vesting period after one year of grant 48 months
Vesting period 4 years
Expiration Term 10 years
Capstone Turbine Corporation 2000 Equity Incentive Plan [Member]  
Stockholders' equity  
Number of shares of common stock reserved for issuance 27,980,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= cpst_CapstoneTurbineCorporation2000EquityIncentivePlanMember
Number of shares available for future grant 3,206,800us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= cpst_CapstoneTurbineCorporation2000EquityIncentivePlanMember