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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	Jun. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
Assets
Accounts receivable	$ 11,346	$ 15,234	$ 15,266
Liabilities and Stockholders’ Equity
Accumulated deficit	$ (1,088,096)	$ (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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