Annual report pursuant to Section 13 and 15(d)

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

v3.20.4
Fair Value of Financial Instruments - Classification of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Total cash equivalents $ 24,210 $ 16,514
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money Market Mutual Funds    
Assets:    
Total cash equivalents 24,210 16,514
Significant Other Observable Inputs (Level 2)    
Assets:    
Total cash equivalents 4,500  
Significant Other Observable Inputs (Level 2) | Commercial Paper    
Assets:    
Total cash equivalents 4,500  
Significant Unobservable Inputs (Level 3)    
Liabilities:    
Warrants 65  
Contingent consideration 65,043 66,358
Liabilities $ 65,108 $ 66,358