Segments and Major Customers (Tables)

9 Months Ended

Sep. 30, 2019

Concentration Risk [Line Items]

Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]

Revenue from customers in the geographic regions based on the location of contracting parties was as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(In thousands)	2019		2018		2019		2018
Taiwan	$	4,186	$	3,962	$	19,047	$	20,419
South Korea	738		388		2,777		10,656
USA	33,218		37,899		97,421		78,983
Japan	3,419		3,889		8,565		20,201
Europe	2,846		4,156		8,861		11,628
Canada	896		820		3,377		4,115
Singapore	7,695		7,953		14,304		14,103
Asia-Other	4,401		687		9,728		2,533
Total	$	57,399	$	59,754	$	164,080	$	162,638

Accounts Receivable [Member]

Concentration Risk [Line Items]

Schedule of customer accounts representing 10% or more than 10% of total revenue

Accounts receivable from the Company’s major customers representing 10% or more of total accounts receivable at September 30, 2019 and December 31, 2018, respectively, was as follows:

	As of
Customer	September 30, 2019		December 31, 2018
Customer 1	22	%	39	%
Customer 2	11	%	*
Customer 3	*		12	%

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*    Customer accounted for less than 10% of total accounts receivable in the period

Sales Net [Member]

Concentration Risk [Line Items]

Schedule of customer accounts representing 10% or more than 10% of total revenue

Revenue from the Company’s major customers representing 10% or more of total revenue for the three and nine months ended September 30, 2019 and 2018, respectively, was as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
Customer	2019		2018		2019		2018
Customer A	14	%	*		15	%	*
Customer B	13	%	*		*		*
Customer C	*		*		10	%	*
Customer D	*		13	%	*		*
Customer E	*		*		*		11	%
Customer F	*		34	%	*		13	%

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*    Customer accounted for less than 10% of total revenue in the period