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Subsequent Events (Details) ¥ in Millions, $ in Millions	1 Months Ended		12 Months Ended
	Jan. 31, 2018 USD ($)	Jan. 31, 2018 CNY (¥)	Dec. 30, 2017 joint_venture_agreement
Subsequent Event [Line Items]
Number of joint venture agreements | joint_venture_agreement			3
Joint Venture One | Subsequent Event
Subsequent Event [Line Items]
Payments to Acquire Interest in Joint Venture	$ 1.0
Joint Venture Two | Subsequent Event
Subsequent Event [Line Items]
Payments to Acquire Interest in Joint Venture	5.3	¥ 35.0
Joint Venture Three | Subsequent Event
Subsequent Event [Line Items]
Payments to Acquire Interest in Joint Venture	$ 2.0

X

- Definition

Number Of Joint Venture Agreements

+ References

No definition available.

+ Details

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Namespace Prefix:	kopn_
Data Type:	xbrli:integerItemType
Balance Type:	na
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X

- Definition

The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

+ Details

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Balance Type:	credit
Period Type:	duration

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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X

- Details

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Namespace Prefix:
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X

- Details

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- Details

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Namespace Prefix:
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X

- Details

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