ERIS Acquisition - Additional Information (Details) - ERIS Technology Corporation $ in Thousands	Jul. 31, 2018 USD ($)
Business Acquisition [Line Items]
Ownership percentage in subsidiary	60.00%
Yea Shin Technology
Business Acquisition [Line Items]
Percentage of shares acquired by subsidiary in acquiree	60.00%
Outstanding shares acquired by subsidiary in cash	$ 6,400
Yong Xiang Development Corporation
Business Acquisition [Line Items]
Total purchase price for business acquisition	25,500
Lease monthly payment for first 8.5 months	40
Lease monthly payment for the remaining period	30
Total lease commitment	$ 1,100
Lease expiration date	Dec. 31, 2020

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Operating leases future minimum payments due in first eight point five months.

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Operating leases future minimum payments due in remaining months.

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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.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Date which lease or group of leases is set to expire, in CCYY-MM-DD format.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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