Supplemental Disclosure of Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Supplemental disclosure of cash flow activities:
Cash paid for income taxes	$ 941	$ 505
Cash paid for interest expense	12	10	$ 5
Supplemental disclosure of non-cash investing and financing activities:
Common stock issued for settlement of restricted stock unit awards	1,020	1,308	1,087
Purchase of property and equipment in accounts payable and accrued expenses	$ 158	1,093	$ 365
Contingent consideration on acquisition		$ 926