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Segments and Major Customers (Details 3) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Major Customer Disclosure
Revenues	$ 58,297	$ 56,458	$ 106,681	$ 102,884
TAIWAN, PROVINCE OF CHINA
Major Customer Disclosure
Revenues	12,760	348	14,861	16,458
South Korea
Major Customer Disclosure
Revenues	758	1,666	2,039	10,267
USA
Major Customer Disclosure
Revenues	29,964	29,864	64,203	41,085
Japan
Major Customer Disclosure
Revenues	2,527	12,278	5,146	16,312
Europe
Major Customer Disclosure
Revenues	2,640	3,605	6,015	7,471
Canada
Major Customer Disclosure
Revenues	1,423	1,885	2,481	3,295
SINGAPORE
Major Customer Disclosure
Revenues	4,725	6,058	6,609	6,150
Asia-Other
Major Customer Disclosure
Revenues	$ 3,500	$ 754	$ 5,327	$ 1,846

X

- Definition

Amount, including 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.

+ References

Reference 1: 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 2: 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

Reference 3: 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

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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