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Summary of Significant Accounting Policies - Accounts and Receivable and Allowance for Doubtful Accounts - ASU 2016-03 (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Accumulated deficit $ (68,193) $ (113,483)
Accounting Standards Update 2016-13    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Change in Accounting Principle, Accounting Standards Update, Adopted true  
Change in Accounting Principle, Accounting Standards Update, Adoption Date Jan. 01, 2020  
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Accumulated deficit   $ (1,200)