Fair Value Measurement - Assets and Liabilities on Recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Liabilities
Risk-adjusted recurring revenue compound annual growth rate, period	5 years
Recurring
Assets
Cash and cash equivalents	$ 5,986	$ 1,128
Liabilities
Contingent consideration, liability	8,300	8,300
Recurring | Level 1
Assets
Cash and cash equivalents	5,986	1,128
Liabilities
Contingent consideration, liability	0	0
Recurring | Level 2
Assets
Cash and cash equivalents	0	0
Liabilities
Contingent consideration, liability	0	0
Recurring | Level 3
Assets
Cash and cash equivalents	0	0
Liabilities
Contingent consideration, liability	$ 8,300	$ 8,300