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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. |  |  |

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- Definition Sublease Agreement, Description + References No definition available. + Details
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- Definition Description of lessee's operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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