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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Operating expense:            
Sales, general and administrative $ 14,943 $ 15,505 $ 29,877 $ 30,770    
Assets            
Prepaid expenses and other current assets 2,035   2,035   $ 2,438 $ 2,249
Liabilities and Stockholders’ Equity            
Accumulated deficit (926,263)   (926,263)   (879,544) $ (879,733)
Cash flows from operating activities            
Net loss (22,540) $ (25,539) (46,719) (49,406)    
Adjustments to reconcile net loss to net cash used in operating activities            
Prepaid expenses and other assets     337 $ 6,368    
Balances Without Adoption of ASC 606 [Member]            
Operating expense:            
Sales, general and administrative 14,963   29,912      
Assets            
Prepaid expenses and other current assets 1,812   1,812      
Liabilities and Stockholders’ Equity            
Accumulated deficit (926,040)   (926,040)      
Cash flows from operating activities            
Net loss     (46,754)      
Adjustments to reconcile net loss to net cash used in operating activities            
Prepaid expenses and other assets     302      
Accounting Standards Update 2014-09 [Member] | Effect of Change Higher/(Lower) [Member]            
Operating expense:            
Sales, general and administrative (20)   (35)      
Assets            
Prepaid expenses and other current assets 223   223   189  
Liabilities and Stockholders’ Equity            
Accumulated deficit $ 223   223   $ 189  
Cash flows from operating activities            
Net loss     35      
Adjustments to reconcile net loss to net cash used in operating activities            
Prepaid expenses and other assets     $ 35