Cash and cash equivalents (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Cash and cash equivalents:
Cash	$ 10,963	$ 12,488
Money market accounts	2,237	2,230
Total cash and cash equivalents	$ 13,200	$ 14,718	$ 8,556	$ 8,849