Represents the portion of non-current inventory that the entity expects to convert to cash, sell or exchange within 13-24 months after the balance sheet date.

No definition available.

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Namespace Prefix:	cpst_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Represents the portion of non-current inventory that the entity expects to convert to cash, sell or exchange within 37-48 months after the balance sheet date.

No definition available.

Name:	cpst_InventoryNoncurrentPortionToBeConvertedWithinThirtySevenToFortyEightMonths
Namespace Prefix:	cpst_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Represents the portion of non-current inventory that the entity expects to convert to cash, sell or exchange within 25-36 months after the balance sheet date.

No definition available.

Name:	cpst_InventoryNoncurrentPortionToBeConvertedWithinTwentyFiveToThirtySixMonths
Namespace Prefix:	cpst_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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

Inventories not expected to be converted to cash, sold or exchanged within the normal operating cycle.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.6(d))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 6

-Subparagraph d

-Article 5

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