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Summary of Significant Accounting Policies (Schedule of Cumulative Effect on Consolidated Balance Sheet for Adoption of ASC 606) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Assets
Prepaid expenses and other current assets	$ 2,028	$ 2,438	$ 2,249
Liabilities and Stockholders’ Equity
Accumulated deficit	(951,307)	(879,544)	$ (879,733)
Accounting Standards Update 2014-09 [Member] | Effect of Change Higher/(Lower) [Member]
Assets
Prepaid expenses and other current assets	236	189
Liabilities and Stockholders’ Equity
Accumulated deficit	$ 236	$ 189

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