Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Sep. 30, 2021
Current assets:
Cash and cash equivalents	$ 80,928	$ 71,621
Restricted cash	21	61
Accounts receivable, net of credit loss of $225 and $260, respectively	27,203	31,849
Contract assets	491	361
Inventory	28,049	32,309
Prepaid expenses and other current assets	6,543	6,877
Assets held for sale	735	1,241
Total current assets	143,970	144,319
Property, plant, and equipment, net	23,837	22,544
Goodwill	69	69
Operating lease right-of-use assets	19,930	13,489
Other intangible assets, net	149	167
Other non-current assets	213	225
Total assets	188,168	180,813
Current liabilities:
Accounts payable	15,317	16,686
Accrued expenses and other current liabilities	10,470	9,936
Operating lease liabilities - current	938	1,198
Total current liabilities	26,725	27,820
Operating lease liabilities - non-current	19,479	12,684
Asset retirement obligations	2,067	2,049
Other long-term liabilities	115	794
Total liabilities	48,386	43,347
Commitments and contingencies (Note 10)
Shareholders’ equity:
Common stock, no par value, 50,000 shares authorized; 44,301 shares issued and 37,395 shares outstanding as of March 31, 2022; 43,890 shares issued and 36,984 shares outstanding as of September 30, 2021	784,371	782,266
Treasury stock at cost; 6,906 shares as of March 31, 2022 and September 30, 2021	(47,721)	(47,721)
Accumulated other comprehensive income	709	687
Accumulated deficit	(597,577)	(597,766)
Total shareholders’ equity	139,782	137,466
Total liabilities and shareholders’ equity	$ 188,168	$ 180,813