Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability	$ 19,600	$ 18,800
Money Market Funds	58,587	68,140
Asset, total	58,587	68,140
Liability, total	19,600	18,800
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability	0	0
Money Market Funds	58,587	68,140
Asset, total	58,587	68,140
Liability, total	0	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability	0	0
Money Market Funds	0	0
Asset, total	0	0
Liability, total	0	0
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability	19,600	18,800
Money Market Funds	0	0
Asset, total	0	0
Liability, total	$ 19,600	$ 18,800