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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)

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