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Convertible Notes - Additional Information (Detail) - USD ($)
12 Months Ended
Feb. 28, 2020
Jan. 07, 2015
Dec. 19, 2014
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]          
Deferred tax liability       $ 5,621,000 $ 6,761,000
Convertible note, net       14,760,000 $ 14,530,000
Debt issuance cost       $ 98,000  
Terex Corporation Note Payable [Member]          
Debt Instrument [Line Items]          
Debt instrument, face amount     $ 7,500,000    
Debenture interest rate     5.00%    
Common stock conversion price     $ 13.65    
Convertible number of common stock     549,451    
Debenture, maturity date     Dec. 19, 2020    
Percentage of debt conversion price       130.00%  
Debt instrument, days before a call is permitted       20 days  
Debt instrument, consecutive trading days       30 days  
Deferred tax liability       $ 321,000  
Net carrying amount of convertible debt       7,323,000  
Convertible note discount amortization       716,000  
Convertible note unamortized discount       $ 177,000  
Terex Corporation Note Payable [Member] | Convertible Subordinated Debt [Member]          
Debt Instrument [Line Items]          
Debt instrument, interest rate, effective percentage       7.50%  
Perella Notes Purchase Agreement [Member]          
Debt Instrument [Line Items]          
Debt instrument, face amount   $ 15,000,000      
Deferred tax liability   257,000      
Convertible note discount amortization       $ 572,000  
Convertible note unamortized discount       142,000  
Net carrying amount of convertible debt       14,858,000  
Convertible note, net       14,760,000  
Debt issuance cost       $ 98,000  
Perella Notes Purchase Agreement [Member] | Subsequent Event [Member]          
Debt Instrument [Line Items]          
Prepayment of convertible note principal amount $ 2,000,000        
Perella Notes Purchase Agreement [Member] | Convertible Subordinated Debt [Member]          
Debt Instrument [Line Items]          
Debt instrument, face amount   $ 15,000,000      
Common stock conversion price   $ 15.00      
Debt instrument, interest rate, effective percentage       7.50%  
Debt instrument, interest rate, effective percentage   6.50%      
Principal amount of convertible notes due date   January 7, 2021