Represents the capacity of generator.

No definition available.

Name:	cpst_CapacityOfGenerator
Namespace Prefix:	cpst_
Data Type:	num:powerItemType
Balance Type:	na
Period Type:	duration

Represents the capacity of applications for which zero emission generators can be exclusively sold.

No definition available.

Name:	cpst_MaximumCapacityOfApplicationsForWhichZeroEmissionGeneratorsCanBeExclusivelySold
Namespace Prefix:	cpst_
Data Type:	num:powerItemType
Balance Type:	na
Period Type:	duration

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