Related Parties - Schedule of Account Receivable and Payable of Related Party Transactions (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Lite On Semiconductor
Related Party Transaction [Line Items]
Accounts receivable	$ 381	$ 301
Accounts payable	4,645	4,333
Keylink
Related Party Transaction [Line Items]
Accounts receivable	5,176	5,394
Accounts payable	5,172	4,295
Nuvoton
Related Party Transaction [Line Items]
Accounts payable	$ 542	$ 950