Represents the right to purchase maximum additional number of shares of common stock under put option.

No definition available.

Name:	cpst_CommonStockRightToPurchaseMaximumAdditionalNumberOfSharesOfCommonStock
Namespace Prefix:	cpst_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Represents the minimum period for which cash and cash equivalents are believed to be sufficient to meet entity's cash needs.

No definition available.

Name:	cpst_MinimumPeriodForWhichCashAndCashEquivalentsAreSufficientToMeetCashNeedsOfEntity
Namespace Prefix:	cpst_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the number of option exercise periods.

No definition available.

Name:	cpst_NumberOfOptionExercisePeriods
Namespace Prefix:	cpst_
Data Type:	xbrli:intItemType
Balance Type:	na
Period Type:	duration

Represents the value of purchase or sales orders currently backlogged, that the entity expects to deliver within the next 12 months.

No definition available.

Name:	cpst_OrderOrProductionBacklogCurrent
Namespace Prefix:	cpst_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the period, after the balance sheet date, during which the entity expects to deliver purchase or sales orders currently backlogged.

No definition available.

Name:	cpst_OrderOrProductionBacklogExpectedShipmentPeriod
Namespace Prefix:	cpst_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the number of units in purchase or sales orders currently backlogged, that the entity expects to deliver within the next 12 months.

No definition available.

Name:	cpst_OrderOrProductionBacklogUnitsCurrent
Namespace Prefix:	cpst_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Name:	us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration