Related Parties - Schedule of Account Receivable and Payable of Related Party Transactions (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Lite On Semiconductor
Related Party Transaction [Line Items]
Accounts receivable	$ 259	$ 342
Accounts payable	4,558	3,308
Keylink
Related Party Transaction [Line Items]
Accounts receivable	3,463	4,089
Accounts payable	4,978	5,016
Nuvoton
Related Party Transaction [Line Items]
Accounts payable	1,793	1,121
JCP
Related Party Transaction [Line Items]
Accounts payable	$ 247	$ 317