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Related Party Transaction - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 5 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | May 18, 2017 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule of Other Related Party Transactions [Line Items] |  |  |  |  |  |  |  |  |
Long-term employee advances |  |  |  |  |  |  |  | $ 500 |
Refundable deposit |  |  |  |  |  |  | $ 48 |  |
Capital lease obligation |  |  |  |  |  |  | $ 1,500 |  |
Capital lease obligation, lease term |  |  |  |  |  |  | 24 months |  |
Capital lease obligation, interest rate |  |  |  |  |  |  | 10.00% |  |
Real Property And Buildings [Member] |  |  |  |  |  |  |  |  |
Schedule of Other Related Party Transactions [Line Items] |  |  |  |  |  |  |  |  |
Sub lease income | $ 6 |  | $ 15 |  | $ 12 | $ 25 |  |  |
Chief Operating Officer [Member] |  |  |  |  |  |  |  |  |
Schedule of Other Related Party Transactions [Line Items] |  |  |  |  |  |  |  |  |
Related party transaction, amount |  |  |  |  |  |  |  | 300 | $ 200
Long-term employee advances |  |  |  |  |  |  |  | 500 |
TMG [Member] |  |  |  |  |  |  |  |  |
Schedule of Other Related Party Transactions [Line Items] |  |  |  |  |  |  |  |  |
Payroll related expenses | 1 |  | 3 |  | 4 | 6 | $ 13 | 13 |
Costs incurred for participating in medical plan |  |  |  |  |  |  | 563 | 503 |
Payment made for providing sales support |  |  |  |  |  |  | 29 | 50 |
Sale of automobile and trailers to subsidiaries |  |  |  |  |  |  |  | 149 |
Gain (loss) on sale of vehicles |  |  |  |  |  |  |  | 34 |
Purchase of equipment and services |  |  |  |  |  |  | 47 | 15 |
Purchase of supplies and services | 44 |  | 15 |  | 44 | 35 |  |  |
TMG [Member] | Operating Leases Related Party [Member] | Subleased Office Space [Member] |  |  |  |  |  |  |  |  |
Schedule of Other Related Party Transactions [Line Items] |  |  |  |  |  |  |  |  |
Sub lease income |  |  |  |  |  |  | 55 |  |
TMG [Member] | Operating Leases Related Party [Member] | Land [Member] |  |  |  |  |  |  |  |  |
Schedule of Other Related Party Transactions [Line Items] |  |  |  |  |  |  |  |  |
Sub lease income | $ 3 |  | $ 3 |  | $ 6 | $ 6 | 12 | 22 |
Applied Cryo Technologies [Member] |  |  |  |  |  |  |  |  |
Schedule of Other Related Party Transactions [Line Items] |  |  |  |  |  |  |  |  |
Purchase of equipment and services |  | $ 302 |  |  |  |  |  |  |
Purchase of equipment repairs and inspection services |  |  |  |  |  |  | $ 63 | $ 56 |
Ownership percentage |  | 51.00% |  |  |  |  | 51.00% | 51.00% |
Payment for equipment repairs and services |  | $ 65 |  |  |  |  |  |  |
TMG [Member] |  |  |  |  |  |  |  |  |
Schedule of Other Related Party Transactions [Line Items] |  |  |  |  |  |  |  |  |
Capital lease obligation |  |  |  |  |  |  |  | $ 10,100 |
Capital lease obligation, description |  |  |  |  |  |  |  | Under the terms of the lease agreement, the Company’s monthly payments are interest-only for the first 12 months at an annual rate of 6%. The Company will then repay 80% of the outstanding lease obligation over the remaining term of 36 months at an annual interest rate of 10%. The Company has accounted for the lease as a finance lease. |
Cost Sharing Agreement [Member] | LNG EF [Member] |  |  |  |  |  |  |  |  |
Schedule of Other Related Party Transactions [Line Items] |  |  |  |  |  |  |  |  |
Amount owed by related party |  |  |  |  |  |  | $ 6,400 | $ 1,600 |
Related party transaction, amount |  |  |  | $ 856 |  |  |  |  |

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