Fair Value of Financial Instruments - Additional Information (Details)	Jun. 30, 2019	Dec. 31, 2018
Discount Rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration liability measurements used (in percentage)	0.061	0.066
Discount Rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration liability measurements used (in percentage)	0.118	0.137
Royalty Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration liability measurements used (in percentage)	0.020