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Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
[1]
Summary of Significant Accounting Policies Details [Line Items]          
Product sales, net $ 15,179 $ 15,888 $ 28,415 $ 32,324  
Assets 186,667   186,667   $ 189,986
Domestic          
Summary of Significant Accounting Policies Details [Line Items]          
Product sales, net 11,900 14,800 22,100 31,800  
Assets 125,800 127,400 125,800 127,400  
Foreign          
Summary of Significant Accounting Policies Details [Line Items]          
Product sales, net 4,900 3,600 9,200 6,500  
Assets $ 60,900 $ 69,000 $ 60,900 $ 69,000  
Sales Revenue | Customer concentration risk | Two Customers          
Summary of Significant Accounting Policies Details [Line Items]          
Concentration risk 47.00%   48.00%    
Sales Revenue | Customer concentration risk | Three Customers          
Summary of Significant Accounting Policies Details [Line Items]          
Concentration risk   55.00%   57.00%  
Sales Revenue | Customer concentration risk | Customer One          
Summary of Significant Accounting Policies Details [Line Items]          
Concentration risk 34.00% 26.00% 36.00% 26.00%  
Sales Revenue | Customer concentration risk | Customer Two          
Summary of Significant Accounting Policies Details [Line Items]          
Concentration risk 13.00% 12.00% 12.00% 15.00%  
Sales Revenue | Customer concentration risk | Customer Three          
Summary of Significant Accounting Policies Details [Line Items]          
Concentration risk   17.00%   16.00%  
Accounts Receivable          
Summary of Significant Accounting Policies Details [Line Items]          
Concentration risk     49.00% 82.00%  
Convertible Notes Payable          
Summary of Significant Accounting Policies Details [Line Items]          
Net carrying value of notes $ 115,300   $ 115,300    
Face value of notes 143,750   143,750    
Term Loan 2021 | Convertible Notes Payable          
Summary of Significant Accounting Policies Details [Line Items]          
Net carrying value of notes 14,200   14,200    
Face value of notes $ 15,000   $ 15,000    
London Interbank Offered Rate (LIBOR) | Term Loan 2021 | Convertible Notes Payable          
Summary of Significant Accounting Policies Details [Line Items]          
Basis spread on variable rate 9.00%   9.00%    
[1] Derived from the audited December 31, 2017 financial statement