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Long-Term Debt - Additional Information (Details) - USD ($)
1 Months Ended 12 Months Ended
Nov. 30, 2018
Oct. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 31, 2018
Mar. 31, 2017
Jun. 30, 2016
Oct. 31, 2015
Apr. 30, 2014
Line of Credit Facility [Line Items]                    
Loss on extinguishment of debt     $ (842,000) $ 0 $ 0          
Unamortized Debt Issuance Expense     $ 2,004,000 384,000            
Exercise Price Of Common Stock Warrants     $ 18.38              
Borrowings under term loan agreements       49,300,000            
Debt Instrument, Unamortized Discount     $ 2,000,000              
Class Of Warrant Or Right, Number Of Securities Called By Warrants Or Rights, Future Draw, Percentage Of Diluted Shares Outstanding     0.30%              
Property and equipment, net     $ 15,171,000 14,057,000            
Accumulated depreciation     16,930,000 17,248,000            
Term Loan Agreement                    
Line of Credit Facility [Line Items]                    
Line of Credit Facility, Maximum Borrowing Capacity   $ 100,000,000             $ 60,000,000.0 $ 45,000,000.0
Proceeds from (Repayments of) Debt     7,800,000              
Long-term Debt, Gross     60,000,000              
Repayments of Debt     50,400,000              
Loss on extinguishment of debt     $ 800,000              
Premium on Exercise Price of Additional Warrants, Debt     25.00%              
Warrants Not Settleable in Cash, Fair Value Disclosure     $ 1,600,000              
Percentage of accrue interest   10.50%             12.00%  
Percentage of deferred payment   3.00%             3.00%  
Upfront Debt Fee, Percentage   0.50%                
Credit facility, additional borrowing capacity   $ 40,000,000.0 20,000,000.0              
Debt Instrument, Unused Borrowing Capacity, Amount             $ 15,000,000      
Borrowings under term loan agreements     $ 60,400,000         $ 45,000,000    
Percentage of redemption fee   4.00%                
Percentage payment up on repayment of principal amount   2.00%                
Long term liability   $ 1,400,000                
Warrants Issued with Debt     341,578              
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 21.12              
Interest expense     $ 7,400,000 $ 6,200,000 $ 5,700,000          
Term Loan Agreement | Maximum                    
Line of Credit Facility [Line Items]                    
Percentage of accrue interest                 12.50%  
Term Loan Agreement | Minimum                    
Line of Credit Facility [Line Items]                    
Percentage of accrue interest                 12.00%  
Percentage of redemption fee   1.00%                
Revolving Credit Facility                    
Line of Credit Facility [Line Items]                    
Interest Expense, Debt     100,000              
Revolving Credit Facility | Secured Revolving Loan Facility                    
Line of Credit Facility [Line Items]                    
Line of Credit Facility, Maximum Borrowing Capacity $ 20,000,000         $ 15,000,000        
Credit facility, outstanding     $ 0              
Debt Instrument, Basis Spread on Variable Rate 4.75%                  
Percentage of accrue interest 8.75%                  
Prime Rate | Revolving Credit Facility | Secured Revolving Loan Facility                    
Line of Credit Facility [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate 0.50%