Fair Values of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Assets
Cash equivalents	$ 9,569	$ 4,657
Liabilities
Contingent consideration - Current	2,775
Contingent consideration - Long-term	2,381	3,889
Liabilities, fair value	5,156
Fair Value, Inputs, Level 1
Assets
Cash equivalents	9,569	4,657
Fair Value, Inputs, Level 3
Liabilities
Contingent consideration - Current	2,775
Contingent consideration - Long-term	2,381	$ 3,889
Liabilities, fair value	$ 5,156