Annual report pursuant to Section 13 and 15(d)

Fair Value Measurement - Fair Value of Contingent Liabilities (Details)

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Fair Value Measurement - Fair Value of Contingent Liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Contingent consideration liabilities balance at the beginning of year $ 599 $ 0
Contingent consideration issued in connection with acquisitions 0 555
Loss on change in fair value 79 44
Contingent consideration liabilities balance at the end of year $ 678 $ 599