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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 10, 2017 | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Entity Incorporation Date Of Incorporation |  |  |  |  | Jan. 11, 1991 |  |  |
Concentration risk, customer |  |  |  |  | no customers that accounted for 10% or more of the Company’s revenues | two customers each accounted for 10% or more of the Company’s revenues |  |
Options and warrants excluded from the calculation of diluted shares |  | 852,552 |  | 852,552 | 852,552 | 852,552 |  |
Production and importation permission description |  |  |  |  | 22 million pounds in 2015 and was reduced by approximately 4.5 million pounds each year to end at zero in 2020. |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  |  |  |  |  | 35.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount |  |  | $ 1,400 |  |  |  |  |
Payables to Customers |  | $ 11,600 | $ 9,800 |  | $ 11,600 |  |  | $ 9,800
Business Combination, Consideration Transferred, Total | $ 209,000 |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  | 40,545 |  | $ 24,706 | 140,804 | $ 115,766 |  |
Operating Loss Carryforwards |  | 5,400 |  |  | $ 5,400 |  |  |
Operating Loss Carryforwards, Limitations on Use |  |  |  |  | $2.8 million of which are subject to annual limitations of approximately $1.3 million. |  |  |
Operating Loss Carry Forwards Expirations Date |  |  |  |  | 2021 |  |  |
Deferred Tax Assets, Valuation Allowance |  | 10,300 |  |  | $ 10,300 |  |  |
State and Local Jurisdiction [Member] |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Operating Loss Carryforwards |  | 3,600 |  |  | 3,600 |  |  |
PNC Bank [Member] |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Proceeds from Lines of Credit | 80,000 |  |  |  | 105,000 |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 150,000 | 80,000 |  |  | 80,000 |  |  |
Debt Instrument, Face Amount |  | $ 29,000 |  |  | 29,000 |  |  |
Term Loan [Member] |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 105,000 |  |  |  |  |  |  |
Scenario, Plan [Member] |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  |  |  |  | 21.00% |
Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income |  |  |  |  |  |  |  | $ 2,400
Financial Service [Member] |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  | $ 1,800 | $ 1,800 |  |
Sales Revenue, Net [Member] |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Aggregate percentage of revenue the from customers accounted for more than 10% |  |  |  |  |  | 37.00% |  |
Customer |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Accounts receivable, net |  |  |  | $ 4,300 |  | $ 4,300 |  |

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