XML 67 R44.htm IDEA: XBRL DOCUMENT v3.19.1
Summary of Significant Accounting Policies - Narrative (Detail)
 3 Months Ended 12 Months Ended
Jun. 01, 2018
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
manufactured_units
segment
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Jan. 01, 2019
USD ($)
Disaggregation of Revenue [Line Items]            
Deferred revenue, revenue recognized     $ 0      
Deferred revenue balance   $ 0 $ 4,095,000 $ 0    
Accounts receivables due period     30 days      
Accounts receivables, allowance for doubtful accounts   0 $ 42,000 0    
Unbilled receivables   0 578,000 0    
Accounts receivable, net   23,377,000 18,989,000 23,377,000    
Revenue generated from transportation     70,532,000 50,313,000 $ 1,172,000  
Inventory write-down     0 0    
Debt fee   1,372,000 728,000 1,372,000    
Amortization of deferred financing cost     300,000 455,000 159,000  
Accretion of debt discount costs     246,000 0 263,000  
Tax Cuts and Jobs Act of 2017, income tax benefit   8,500,000        
Recognized income tax interest and penalties     0 0 $ 0  
Probable environmental matters   $ 0 $ 0 $ 0    
Number of operating segments | segment     1      
Antidilutive securities excluded from computation of earnings per share (in shares) | shares     854 251 0  
Quickthree Solutions            
Disaggregation of Revenue [Line Items]            
Adjustment period 3 years   3 years      
Minimum | Quickthree Solutions            
Disaggregation of Revenue [Line Items]            
Measurement basis, manufactured units | manufactured_units     9      
Maximum | Quickthree Solutions            
Disaggregation of Revenue [Line Items]            
Measurement basis, manufactured units | manufactured_units     50      
Scenario, Forecast            
Disaggregation of Revenue [Line Items]            
Initial right of use assets           $ 36,000,000
Initial lease liabilities           $ 36,000,000
Pending Litigation            
Disaggregation of Revenue [Line Items]            
Accounts receivable, net     $ 11,360,000