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Commitments and Contingencies - Additional Information (Detail) - USD ($)
 1 Months Ended 6 Months Ended 12 Months Ended
Jan. 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2014
Commitments And Contingencies [Line Items]              
Operating lease, rent expense       $ 872,000 $ 1,300,000    
Denver, Colorado [Member]              
Commitments And Contingencies [Line Items]              
Lease term             5 years
Operating lease, rent expense   $ 60,000 $ 120,000 $ 231,000 $ 209,000    
Denver, Colorado [Member] | TMG [Member]              
Commitments And Contingencies [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      
Fort Lupton, Colorado [Member]              
Commitments And Contingencies [Line Items]              
Lease term 1 year         2 years  
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.