Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments - Classification of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details)

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Fair Value of Financial Instruments - Classification of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value, Recurring - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Total cash equivalents $ 36,109 $ 16,514
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money Market Mutual Funds    
Assets:    
Total cash equivalents 36,109 16,514
Significant Unobservable Inputs (Level 3)    
Liabilities:    
Warrants 21,410  
Contingent consideration 98,037 66,358
Liabilities $ 119,447 $ 66,358