Geographic Data - Schedule of Revenue by Geographic Areas (Details 2) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Long-Lived Assets
Long-lived assets	$ 82,111	$ 69,872
United States | Operating Segments
Long-Lived Assets
Long-lived assets	42,488	32,239
China | Operating Segments
Long-Lived Assets
Long-lived assets	33,013	30,937
United Kingdom | Operating Segments
Long-Lived Assets
Long-lived assets	569	1,042
Taiwan | Operating Segments
Long-Lived Assets
Long-lived assets	2,755	2,694
Czech Republic | Operating Segments
Long-Lived Assets
Long-lived assets	2,634	2,029
Other non-U.S | Operating Segments
Long-Lived Assets
Long-lived assets	$ 652	$ 931