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Long-term Debt - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2018
Jan. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Nov. 30, 2018
Mar. 31, 2017
Jun. 30, 2016
Oct. 31, 2015
Apr. 30, 2014
Line of Credit Facility [Line Items]                    
Borrowings under term loan agreements         $ 60,400,000          
Minimum liquidity $ 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%                  
Debt Instrument, Unamortized Discount     $ 1,900,000   2,000,000          
Term Loan Agreement                    
Line of Credit Facility [Line Items]                    
Interest Expense     1,700,000 $ 1,600,000            
Credit facility, maximum borrowing capacity $ 100,000,000               $ 60,000,000.0 $ 45,000,000.0
Gain (Loss) on Extinguishment of Debt         $ 800,000          
Unused borrowing capacity, amount             $ 15,000,000      
Percentage of accrue interest                 12.00%  
Percentage of deferred payment                 3.00%  
Interest deferral period 6 years                  
Borrowings under term loan agreements     60,900,000         $ 45,000,000    
Long term liability $ 1,400,000                  
Proceeds from (Repayments of) Debt 7,800,000                  
Long-term Debt, Gross 60,000,000                  
Repayments of Debt 50,400,000                  
Line of Credit Facility, Remaining Borrowing Capacity $ 40,000,000                  
Warrants Issued with Debt 341,578                  
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 21.12                  
Premium on Exercise Price of Additional Warrants, Debt 25.00%                  
Warrants Not Settleable in Cash, Fair Value Disclosure $ 1,600,000                  
Debt Instrument, Redemption Price, Percentage 4.00%                  
Term Loan Agreement | Minimum                    
Line of Credit Facility [Line Items]                    
Percentage of accrue interest                 12.00%  
Debt Instrument, Redemption Price, Percentage 1.00%                  
Term Loan Agreement | Maximum                    
Line of Credit Facility [Line Items]                    
Percentage of accrue interest                 12.50%  
CRG Servicing LLC Amended And Restated Loan Agreement [Member]                    
Line of Credit Facility [Line Items]                    
Line of Credit Facility, Commitment Fee Percentage 2.00%                  
Percentage of accrue interest 10.50%                  
Percentage of deferred payment 3.00%                  
Revolving Credit Facility | Secured Revolving Loan Facility                    
Line of Credit Facility [Line Items]                    
Credit facility, maximum borrowing capacity   $ 15,000,000       $ 20,000,000        
Variable rate   4.75%                
Percentage of accrue interest   8.75%                
Long-term Line of Credit     $ 0              
Prime Rate | Revolving Credit Facility | Secured Revolving Loan Facility                    
Line of Credit Facility [Line Items]                    
Variable rate   0.50%                
Debt Instrument, Redemption, Period One [Member] | Term Loan Agreement                    
Line of Credit Facility [Line Items]                    
Line of Credit Facility, Current Borrowing Capacity $ 20,000,000                  
Debt Instrument, Redemption, Period Two [Member] | Term Loan Agreement                    
Line of Credit Facility [Line Items]                    
Line of Credit Facility, Current Borrowing Capacity $ 20,000,000