Accounting Policies - VIEs, Income Statement (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Revenue	$ 61,205	$ 77,361	$ 84,968
Gross profit	5,760	11,325	14,306
Net income (loss)	$ (3,075)	$ 321	$ 2,413