Tabular disclosure of the carrying amount as of the balance sheet date of current and noncurrent merchandise, goods, commodities, or supplies held for sale or to be used in manufacturing, servicing or production process.

No definition available.

Name:	cpst_ScheduleOfInventoryTableTextBlock
Namespace Prefix:	cpst_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

Tabular disclosure of the period during which the entity expects to use the amounts, as of the balance sheet date, of noncurrent merchandise, goods, commodities, or supplies held for sale or to be used in manufacturing, servicing or production process.

No definition available.

Name:	cpst_ScheduleOfInventoryUsageNoncurrentTableTextBlock
Namespace Prefix:	cpst_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

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