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Subsequent Events - Additional Information (Details) - ERIS Technology Corporation
$ in Thousands, $ in Millions
Jul. 31, 2018
USD ($)
Jul. 31, 2018
TWD ($)
Jul. 31, 2018
TWD ($)
Jun. 30, 2018
Subsequent Event [Line Items]        
Ownership percentage in subsidiary       60.00%
Subsequent Events | Yea Shin Technology        
Subsequent Event [Line Items]        
Percentage of shares acquired by subsidiary in acquiree 60.00%   60.00%  
Outstanding shares acquired by subsidiary in cash $ 6,400 $ 193.9    
Subsequent Events | Yong Xiang Development Corporation        
Subsequent Event [Line Items]        
Total purchase price for business acquisition 25,500 $ 776.0    
Lease monthly payment for first 8.5 months 40   $ 1.2  
Lease monthly payment for the remaining period 30   $ 1.0  
Total lease commitment $ 1,100      
Lease expiration date Dec. 31, 2020 Dec. 31, 2020