Related Parties - Schedule of Account Receivable and Payable of Related Party Transactions (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Related Party Transaction [Line Items]
Accounts receivable	$ 4,764	$ 4,357
Accounts payable	13,643	12,097
Lite On Semiconductor
Related Party Transaction [Line Items]
Accounts receivable	71	215
Accounts payable	5,434	4,458
Keylink
Related Party Transaction [Line Items]
Accounts receivable	4,693	4,142
Accounts payable	6,605	6,472
Nuvoton
Related Party Transaction [Line Items]
Accounts payable	$ 1,604	$ 1,167