Long-Term Debt (Details Textual) - USD ($)						3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 20, 2019	Sep. 01, 2019	Aug. 02, 2019	Feb. 28, 2019	Sep. 01, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2017	Aug. 20, 2019	Jul. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Jul. 21, 2017
Line of Credit Facility [Line Items]
Debt borrowings								$ 52,592,000	$ 557,000
Long-term Debt						$ 195,016,000		195,016,000					$ 168,767,000
Revolving Credit Facility, Capacity Available for Letter of Credit						30,000,000		30,000,000
Loss on debt restructuring						0	$ 0	2,270,000	$ 0
Insurance Premium Financing Agreement												$ 20,700,000		$ 17,800,000
Insurance Premium Financing Agreement, Periodic Payment		$ 2,400,000			$ 2,000,000
Insurance Premium Financing Agreement, Interest Rate		5.25%												4.75%
Insurance Premium Payable						18,600,000		$ 18,600,000					$ 10,000,000
ABL Facility [Member] | Minimum | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Debt instrument variable rate margin (as a percentage)								1.50%
ABL Facility [Member] | Minimum | Base Rate
Line of Credit Facility [Line Items]
Debt instrument variable rate margin (as a percentage)								0.50%
ABL Facility [Member] | Maximum | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Debt instrument variable rate margin (as a percentage)								2.25%
ABL Facility [Member] | Maximum | Base Rate
Line of Credit Facility [Line Items]
Debt instrument variable rate margin (as a percentage)										1.25%
ABL Facility [Member] | Revolving credit facility
Line of Credit Facility [Line Items]
Debt borrowings				$ 141,400,000
Line of Credit Facility, Maximum Borrowing Capacity				200,000,000											$ 200,000,000
Line of Credit Facility, Increase (Decrease), Net				$ 100,000,000.0
Total availability under revolving credit facility						29,200,000		$ 29,200,000
ABL Facility [Member] | Revolving credit facility | Minimum | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Debt instrument variable rate margin (as a percentage)				1.50%
ABL Facility [Member] | Revolving credit facility | Minimum | Base Rate
Line of Credit Facility [Line Items]
Debt instrument variable rate margin (as a percentage)				0.50%
ABL Facility [Member] | Revolving credit facility | Maximum | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Debt instrument variable rate margin (as a percentage)				2.00%
ABL Facility [Member] | Revolving credit facility | Maximum | Base Rate
Line of Credit Facility [Line Items]
Debt instrument variable rate margin (as a percentage)				1.00%
Average annualized interest rate (as a percentage)								5.20%
ABL Facility [Member] | Revolving credit facility | FILO Loans [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases				$ 15,000,000
ABL Facility [Member] | Revolving credit facility | Non-FILO Loans [Member] | Minimum | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Debt instrument variable rate margin (as a percentage)				2.50%
ABL Facility [Member] | Revolving credit facility | Non-FILO Loans [Member] | Minimum | Base Rate
Line of Credit Facility [Line Items]
Debt instrument variable rate margin (as a percentage)				1.50%
ABL Facility [Member] | Revolving credit facility | Non-FILO Loans [Member] | Maximum | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Debt instrument variable rate margin (as a percentage)				3.00%
ABL Facility [Member] | Revolving credit facility | Non-FILO Loans [Member] | Maximum | Base Rate
Line of Credit Facility [Line Items]
Debt instrument variable rate margin (as a percentage)				2.00%
ABL Facility [Member] | Bridge Loan [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity				$ 20,000,000											20,000,000
ABL Facility [Member] | Letter of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity															30,000,000
ABL Facility [Member] | Term Loan Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity															56,800,000
ABL Facility [Member] | Asset-Based Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity															$ 35,000,000
Term Loan Credit Facility [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Debt borrowings				51,100,000
Long-term Debt						61,100,000		$ 61,100,000
Average annualized interest rate (as a percentage)								10.50%
Term Loan Credit Facility [Member] | Line of Credit [Member] | Tranche A Term Loans [Member]
Line of Credit Facility [Line Items]
Long-term Debt						40,300,000		$ 40,300,000
Term Loan Credit Facility [Member] | Line of Credit [Member] | Tranche A Term Loans [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Debt instrument variable rate margin (as a percentage)								7.50%
Term Loan Credit Facility [Member] | Line of Credit [Member] | Tranche A FILO Term Loans [Member]
Line of Credit Facility [Line Items]
Long-term Debt						2,500,000		$ 2,500,000
Term Loan Credit Facility [Member] | Line of Credit [Member] | Tranche A FILO Term Loans [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Debt instrument variable rate margin (as a percentage)								8.50%
Term Loan Credit Facility [Member] | Line of Credit [Member] | Tranche A FILO Term Loans [Member] | Base Rate
Line of Credit Facility [Line Items]
Debt instrument variable rate margin (as a percentage)								7.50%
Term Loan Credit Facility [Member] | Line of Credit [Member] | Tranche B Term Loans [Member]
Line of Credit Facility [Line Items]
Long-term Debt						8,300,000		$ 8,300,000
Term Loan Credit Facility [Member] | Line of Credit [Member] | Asset-Based Facility [Member]
Line of Credit Facility [Line Items]
Long-term Debt						10,000,000		$ 10,000,000
Term Loan Credit Facility [Member] | Line of Credit [Member] | Tranche A Term Loans, Tranche B Term Loans, and Capital Expenditure Loans [Member] | Base Rate
Line of Credit Facility [Line Items]
Debt instrument variable rate margin (as a percentage)								6.50%
ABL Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Debt instrument variable rate margin (as a percentage)			7.50%
Multiple Advance Revolving Credit Notes [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Debt instrument variable rate margin (as a percentage)	7.50%
Multiple Advance Revolving Credit Notes [Member] | Revolving credit facility
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 20,000,000
Elliott Management Corporation [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity				$ 61,100,000		$ 40,400,000		$ 40,400,000
Letters of Credit Outstanding, Amount			$ 20,000,000								$ 30,000,000.0