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Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
[1]
Dec. 16, 2014
Summary of Significant Accounting Policies Details [Line Items]        
Product sales, net $ 13,236 $ 16,436    
Assets 181,092   $ 189,986  
Domestic        
Summary of Significant Accounting Policies Details [Line Items]        
Product sales, net 10,200 16,900    
Assets 115,900 125,500    
Foreign        
Summary of Significant Accounting Policies Details [Line Items]        
Product sales, net 4,300 3,000    
Assets $ 65,200 $ 64,800    
Sales Revenue | Customer concentration risk | Three Customers        
Summary of Significant Accounting Policies Details [Line Items]        
Concentration risk 59.00% 58.00%    
Sales Revenue | Customer concentration risk | Customer One        
Summary of Significant Accounting Policies Details [Line Items]        
Concentration risk 38.00% 13.00%    
Sales Revenue | Customer concentration risk | Customer Two        
Summary of Significant Accounting Policies Details [Line Items]        
Concentration risk 11.00% 27.00%    
Sales Revenue | Customer concentration risk | Customer Three        
Summary of Significant Accounting Policies Details [Line Items]        
Concentration risk 10.00% 18.00%    
Accounts Receivable        
Summary of Significant Accounting Policies Details [Line Items]        
Concentration risk 52.00% 94.00%    
Convertible Notes Payable        
Summary of Significant Accounting Policies Details [Line Items]        
Net carrying value of notes $ 123,600      
Face value of notes $ 143,750      
Stated interest rate 3.75% 3.75% 3.75%  
Convertible Notes Payable        
Summary of Significant Accounting Policies Details [Line Items]        
Stated interest rate 3.75%     3.75%
[1] Derived from the audited December 31, 2017 financial statements