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Summary of Significant Accounting Policies (Schedule of Impact of Revenue Standards Adoption on Financial Statements) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
Operating expense:
Sales, general and administrative	$ 13,506	$ 13,952	$ 43,383	$ 44,722
Assets
Prepaid expenses and other current assets	2,028		2,028		$ 2,438	$ 2,249
Liabilities and Stockholders’ Equity
Accumulated deficit	(951,307)		(951,307)		(879,544)	$ (879,733)
Cash flows from operating activities
Net loss	(25,044)	$ (22,021)	(71,763)	(71,427)
Adjustments to reconcile net loss to net cash used in operating activities
Prepaid expenses and other assets			537	$ 7,361
Balances Without Adoption of ASC 606 [Member]
Operating expense:
Sales, general and administrative	13,518		43,430
Assets
Prepaid expenses and other current assets	1,792		1,792
Liabilities and Stockholders’ Equity
Accumulated deficit	(951,071)		(951,071)
Cash flows from operating activities
Net loss			(71,810)
Adjustments to reconcile net loss to net cash used in operating activities
Prepaid expenses and other assets			490
Accounting Standards Update 2014-09 [Member] | Effect of Change Higher/(Lower) [Member]
Operating expense:
Sales, general and administrative	(12)		(47)
Assets
Prepaid expenses and other current assets	236		236		189
Liabilities and Stockholders’ Equity
Accumulated deficit	$ 236		236		$ 189
Cash flows from operating activities
Net loss			47
Adjustments to reconcile net loss to net cash used in operating activities
Prepaid expenses and other assets			$ 47

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