Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net loss	$ (9,090)	$ (14,274)
Adjustments to reconcile net loss to net cash flows provided by operating activities:
Depreciation and amortization	15,203	21,028
Stock compensation expense	688	716
Loss on investments, net	1,679	6,462
Deferred income taxes	(1,014)	(4,224)
Amortization of deferred credits	(213)	(213)
Amortization of debt discount and issuance costs and accretion of interest into long-term debt	1,379	3,199
Intangible asset impairment	3,719
Other	55	243
Changes in assets and liabilities:
Receivables	(9,137)	248
Expendable parts and supplies	1,150	(978)
Prepaid expenses and other operating assets and liabilities	2,290	2,094
Accounts payable	(7,008)	174
Deferred revenue	(5,256)	(4,184)
Accrued expenses and other liabilities	(656)	(4,868)
Operating lease right-of-use assets and liabilities	177	(672)
Net cash provided by (used in) operating activities	(6,034)	4,751
Cash flows from investing activities:
Capital expenditures	(16,740)	(19,775)
Investments in equity securities		(200)
Refund (payment) of equipment and other deposits	131	(6,954)
Net cash used in investing activities	(16,609)	(26,929)
Cash flows from financing activities:
Proceeds from long-term debt	39,000	30,811
Principal payments on long-term debt and finance leases	(17,544)	(24,510)
Payments of debt and warrant issuance costs	(417)	(2,293)
Repurchase of stock	(1)	(15)
Net cash provided by financing activities	21,038	3,993
Net change in cash, cash equivalents and restricted cash	(1,605)	(18,185)
Cash, cash equivalents and restricted cash at beginning of period	61,025	123,867
Cash, cash equivalents and restricted cash at end of period	59,420	105,682
Supplemental cash flow information
Cash paid for interest	7,763	2,815
Operating lease payments in operating cash flows	4,679	10,152
Supplemental non-cash operating activities
Right-of-use assets obtained in exchange for lease liabilities	236	4,190
Supplemental non-cash financing activities
Finance lease obtained in exchange for lease liability	$ 76,185
Investments in warrants to purchase common stock		100
Accrued capital expenditures		$ 1,722