Fair Value Measurement - Valuation Techniques and Significant Unobservable Inputs (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Contingent consideration, fair value			$ 7,766	$ 0
Theoretical recurring revenue		$ 1,000
Contingent consideration | Real options approach | Level 3
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Contingent consideration, fair value	$ 8,300	$ 8,300
Risk-adjusted expected growth rates		97.00%
Contingent consideration | Real options approach | Level 3 | Minimum
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Discount rate/time value	2.50%	2.50%
Contingent consideration | Real options approach | Level 3 | Maximum
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Discount rate/time value	4.50%	4.50%
Contingent consideration | Real options approach 2018-2021 | Level 3 | Minimum
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Risk-adjusted expected growth rates	50.80%