Other Assets and Liabilities - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Other Liabilities Disclosure [Abstract]
Valued-added tax recoverable	$ 736	$ 1,099
Prepaid expenses	3,442	2,921
Advance to suppliers and other current assets	1,265	518
Income tax receivable	451	3,526
Total	$ 5,894	$ 8,064