Revenue by Customer or Customer Group (Details) - USD ($) $ in Thousands	3 Months Ended
Sep. 30, 2018	Oct. 01, 2017
Entity Wide Revenue Major Customer [Line Items]
Revenue	$ 117,159	$ 102,460
Fiat Chrysler Automobiles
Entity Wide Revenue Major Customer [Line Items]
Revenue	30,297	24,102
General Motors Company
Entity Wide Revenue Major Customer [Line Items]
Revenue	25,287	20,338
Ford Motor Company
Entity Wide Revenue Major Customer [Line Items]
Revenue	15,523	15,373
Tier 1 Customers
Entity Wide Revenue Major Customer [Line Items]
Revenue	17,816	15,743
Commercial and Other OEM Customers
Entity Wide Revenue Major Customer [Line Items]
Revenue	20,928	17,867
Hyundai / Kia
Entity Wide Revenue Major Customer [Line Items]
Revenue	$ 7,308	$ 9,037

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration