Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions		12 Months Ended
	Oct. 10, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Significant Accounting Policies [Line Items]
Concentration risk, customer			two customers each accounted for 10% or more of the Company’s revenues	two customers each 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			0	73,034	106,290
Production and importation permission description			22 million pounds in 2015 and was reduced by approximately 4.5 million pounds each year ending at zero in 2020.
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			35.00%	35.00%	34.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount			$ 1.4
Payables to Customers			9.8
Business Combination, Consideration Transferred, Total	$ 209.0
Management Fees Revenue			2.4
PNC Bank [Member]
Significant Accounting Policies [Line Items]
Proceeds from Lines of Credit	80.0		105.0
Line of Credit Facility, Maximum Borrowing Capacity	150.0		80.0
Debt Instrument, Face Amount			65.0
Term Loan [Member]
Significant Accounting Policies [Line Items]
Debt Instrument, Face Amount	$ 105.0
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			$ 2.4
Sales Revenue, Net [Member]
Significant Accounting Policies [Line Items]
Aggregate percentage of revenue the from customers accounted for more than 10%			33.00%	30.00%	33.00%
Customer
Significant Accounting Policies [Line Items]
Accounts receivable, net			$ 2.7