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Summary of Significant Accounting Policies (Schedule of Cumulative Effect on Consolidated Balance Sheet for Adoption of ASU 2016-13) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
Assets      
Accounts receivable $ 11,806 $ 15,234 $ 15,266
Liabilities and Stockholders’ Equity      
Accumulated deficit $ (1,111,804) $ (1,066,272) (1,066,240)
Revision of Prior Period, Accounting Standards Update, Adjustment [Member]      
Assets      
Accounts receivable     (32)
Liabilities and Stockholders’ Equity      
Accumulated deficit     $ (32)