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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								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
Operating Expense:
Sales, general and administrative									$ 63,489	$ 59,119	$ 47,787
Assets
Prepaid expenses and other current assets	$ 2,832				$ 2,249				2,832	2,249		$ 2,438
Liabilities and Stockholders’ Equity
Accumulated deficit	(982,106)				(879,733)				(982,106)	(879,733)		(879,544)
Cash flows from operating activities
Net loss	(30,799)	$ (25,044)	$ (22,540)	$ (24,179)	$ (20,762)	$ (22,021)	$ (25,539)	$ (23,867)	(102,562)	(92,189)	(74,375)
Adjustments to reconcile net loss to net cash used in operating activities
Prepaid expenses and other assets									(290)	$ 7,803	$ (202)
Balances Without Adoption of ASC 606 [Member]
Operating Expense:
Sales, general and administrative									63,547
Assets
Prepaid expenses and other current assets	2,585								2,585
Liabilities and Stockholders’ Equity
Accumulated deficit	(981,859)								(981,859)
Cash flows from operating activities
Net loss									(102,620)
Adjustments to reconcile net loss to net cash used in operating activities
Prepaid expenses and other assets									(348)
Accounting Standards Update 2014-09 [Member] | Effect of Change Higher/(Lower) [Member]
Operating Expense:
Sales, general and administrative									(58)
Assets
Prepaid expenses and other current assets	247								247			189
Liabilities and Stockholders’ Equity
Accumulated deficit	$ 247								247			$ 189
Cash flows from operating activities
Net loss									58
Adjustments to reconcile net loss to net cash used in operating activities
Prepaid expenses and other assets									$ 58

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