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Summary of Significant Accounting Policies - Additional Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
shares
Sep. 30, 2018
USD ($)
shares
Sep. 30, 2019
USD ($)
segment
shares
Sep. 30, 2018
USD ($)
shares
Jan. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
Significant Accounting Policies [Line Items]            
Number of Reportable Segments | segment     1      
Options and warrants excluded from the calculation of diluted shares | shares 4,807,377 785,697 4,807,377 785,697    
Production and importation permission description     22 million pounds in 2015 and was reduced by approximately 4.5 million pounds each year ending at zero in 2020.      
Revenue from Contract with Customer, Including Assessed Tax $ 45,631 $ 40,545 $ 136,306 $ 140,804    
Operating Loss Carryforwards 39,100   $ 39,100      
Percentage of tax earnings     80.00%      
Annual limitation of NOLs     $ 1,300      
Deferred Tax Assets, Valuation Allowance           $ 11,300
Operating Lease, Liability 6,529   6,529      
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount     16,900      
PNC Facility [Member]            
Significant Accounting Policies [Line Items]            
Contractual Obligation 14,000   14,000      
Borrowing From Related Parties     23,000      
No Expiration [Member]            
Significant Accounting Policies [Line Items]            
Operating Loss Carryforwards 33,700   33,700      
Expiration Through 2023            
Significant Accounting Policies [Line Items]            
Operating Loss Carryforwards 5,400   5,400      
State and Local Jurisdiction [Member]            
Significant Accounting Policies [Line Items]            
Operating Loss Carryforwards 20,000   20,000      
Accounting Standards Update 2016-09 [Member]            
Significant Accounting Policies [Line Items]            
Operating Lease, Liability         $ 8,100  
Financial Service [Member]            
Significant Accounting Policies [Line Items]            
Revenue from Contract with Customer, Including Assessed Tax     $ 1,800 $ 1,800    
No Customer | Revenue from Contract with Customer [Member]            
Significant Accounting Policies [Line Items]            
Concentration Risk, Percentage       10.00%    
One Customer | Revenue from Contract with Customer [Member]            
Significant Accounting Policies [Line Items]            
Concentration Risk, Percentage     13.00%      
One Customer | Accounts Receivable            
Significant Accounting Policies [Line Items]            
Accounts Receivable, net $ 3,300   $ 3,300