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Long-Term Debt - Additional Information (Detail) - USD ($)
1 Months Ended 6 Months Ended
Jan. 26, 2018
Jan. 12, 2018
Feb. 15, 2017
Jun. 26, 2015
Dec. 31, 2014
Aug. 31, 2014
Jun. 30, 2018
Jul. 17, 2018
Dec. 22, 2017
Jun. 30, 2017
Jul. 29, 2014
Jul. 31, 2013
Credit Agreement [Member]                        
Debt Instrument [Line Items]                        
Outstanding borrowings under revolving credit facility             $ 59,500,000          
Weighted-average interest rate of borrowings             5.59%          
Credit facility remaining borrowing capacity             $ 25,500,000          
Additional Equipment Loan [Member]                        
Debt Instrument [Line Items]                        
Credit facility remaining borrowing capacity           $ 1,200,000            
Equipment Loan, face amount                     $ 6,000,000  
Percentage for base rate loans at the prime rate 3.50%         3.40%            
Equipment Loan, monthly payment $ 7,986         $ 87,800            
Equipment Loan, maturity date Jun. 26, 2020           Jul. 31, 2019          
Company's bank debt             $ 1,302,000          
Additional equipment Loan, drawings         $ 500,000 $ 4,800,000            
Equipment Loan, interest rate description             Interim draws on this facility carried a floating interest rate; payable monthly at the LIBO published rate plus 2.50% and on June 26, 2015 converted into a fixed term loan, with a rate of 3.50% and requiring monthly payments          
Equipment Loan, principal payment amount   $ 20,858                    
Additional Equipment Loan [Member] | Significant Unobservable Inputs (Level 3) [Member]                        
Debt Instrument [Line Items]                        
Debt Instrument, Fair Value Disclosure             $ 1,346,000     $ 4,751,000    
Fixed Term Loan [Member] | Additional Equipment Loan [Member]                        
Debt Instrument [Line Items]                        
Equipment Loan, monthly payment       $ 8,700                
Equipment Loan, maturity date             Jun. 26, 2020          
Equipment Loan, Interest rate on fixed loans             3.50%          
2017 Credit Agreement [Member]                        
Debt Instrument [Line Items]                        
Credit facility borrowing capacity     $ 300,000,000                  
Credit agreement date     Feb. 15, 2017                  
Maturity date of amended and restated credit agreement     Feb. 15, 2021                  
Credit facility borrowing base               $ 90,000,000 $ 85,000,000      
London Interbank Offered Rate (LIBOR) [Member] | Additional Equipment Loan [Member]                        
Debt Instrument [Line Items]                        
LIBOR rate loans             2.50%          
Base Rate And Libor [Member] | Credit Agreement [Member]                        
Debt Instrument [Line Items]                        
Debt instrument basis weighted average interest rate spread on variable rate             5.38%     5.20%    
Equipment Loan [Member]                        
Debt Instrument [Line Items]                        
Equipment Loan, face amount                       $ 10,000,000
Percentage for base rate loans at the prime rate             3.95%          
Equipment Loan, monthly payment             $ 184,000          
Equipment Loan, maturity date             Jul. 31, 2018          
Company's bank debt             $ 179,000