Investment in Unconsolidated Entity - Summary of Financial Information of Investment (Details) - Challenger Subsidiary [Member] $ in Thousands	2 Months Ended
	Sep. 30, 2017 USD ($)
Schedule of Equity Method Investments [Line Items]
Cash	$ 3,269
Accounts receivable	164
Inventory	59,320
Goodwill	4,840
Other assets	5,133
Total assets	72,726
Accounts payable	2,244
Accrued expenses	2,559
Notes payable	41,662
Equity	26,261
Total liabilities and equity	72,726
Revenues	21,955
Gross profit	5,694
Income before taxes	$ 1,940