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Lease Obligations - Additional Information (Detail) - USD ($)
 1 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2019
Jan. 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2014
Lessee, Lease, Description [Line Items]                
Total rent expense         $ 872,000 $ 1,300,000    
Liquefaction Plants And Systems [Member]                
Lessee, Lease, Description [Line Items]                
Equipment lease, description     In December 2018, the Company entered into a one year lease for equipment used at our liquefaction plant in George West, Texas. The lease called for monthly payments of $13 thousand through December 31, 2019.          
Equipment lease, term of contract     1 year          
Fort Lupton, Colorado [Member]                
Lessee, Lease, Description [Line Items]                
Equipment lease, description   In January 2019, the Company extended its lease for one year for yard space from an unrelated party in Fort Lupton, Colorado. The lease called for monthly payments of $2,000 through December 31, 2019.     In 2016, the Company entered into a two-year operating lease for yard space from an unrelated party in Fort Lupton, Colorado. The lease called for monthly payments of $2,000 through May 2018.      
Equipment lease, term of contract   1 year         2 years  
Denver, Colorado [Member]                
Lessee, Lease, Description [Line Items]                
Non-cancelable operating leases term 5 years              
Total rent expense     $ 60,000 $ 120,000 $ 231,000 $ 209,000    
Equipment lease, term of contract               5 years
Denver, Colorado [Member] | TMG [Member]                
Lessee, Lease, Description [Line Items]                
Sublease arrangement, description     In February of 2018, the Company began to sublease a portion of the office space to a subsidiary of TMG for $5 thousand a month through December 2018 and $2 thousand a month beginning January 2019   In February of 2018, the Company began to sublease a portion of the office space to a subsidiary of TMG for $5 thousand a month      
Minimum [Member]                
Lessee, Lease, Description [Line Items]                
Remaining operating lease term     1 year          
Maximum [Member]                
Lessee, Lease, Description [Line Items]                
Remaining operating lease term     5 years