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Summary of Significant Accounting Policies Recently Adopted Accounting Pronouncements 2016-02 (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Jan. 01, 2018
Assets          
Prepaid expenses and other current assets $ 20,777 $ 15,540 $ 11,458 $ 11,775 $ 5,694
Operating lease right-of-use assets 30,561 27,803 16,945 0  
Liabilities and Stockholders’ Equity          
Other current liabilities 4,451 11,139 4,940 1,447  
Operating lease liabilities $ 41,991 $ 36,138 20,056 0  
Other long-term liabilities     159 $ 7,080  
Accounting Standards Update 2016-02          
Assets          
Prepaid expenses and other current assets     (317)    
Operating lease right-of-use assets     16,945    
Liabilities and Stockholders’ Equity          
Other current liabilities     3,493    
Operating lease liabilities     20,056    
Other long-term liabilities     $ (6,921)