Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Current assets:
Cash and cash equivalents	$ 71,621	$ 30,390
Restricted cash	61	148
Accounts receivable, net of allowance of $260 and $227, respectively	31,849	25,324
Contract assets	361	1,566
Inventory	32,309	25,525
Prepaid expenses and other current assets	6,877	5,589
Assets held for sale	1,241	1,568
Total current assets	144,319	90,110
Property, plant, and equipment, net	22,544	21,052
Goodwill	69	69
Operating lease right-of-use assets	13,489	14,566
Other intangible assets, net	167	202
Other non-current assets	225	242
Total assets	180,813	126,241
Current liabilities:
Accounts payable	16,686	16,484
Accrued expenses and other current liabilities	9,936	11,577
Operating lease liabilities - current	1,198	992
Total current liabilities	27,820	29,053
PPP Loan liability - non-current	0	6,488
Operating lease liabilities - non-current	12,684	13,735
Asset retirement obligations	2,049	2,022
Other long-term liabilities	794	794
Total liabilities	43,347	52,092
Commitments and contingencies (Note 11)
Shareholders’ equity:
Common stock, no par value, 50,000 shares authorized; 43,890 shares issued and 36,984 shares outstanding as of September 30, 2021; 36,461 shares issued and 29,551 shares outstanding as of September 30, 2020	782,266	744,361
Treasury stock at cost; 6,906 shares	(47,721)	(47,721)
Accumulated other comprehensive income	687	918
Accumulated deficit	(597,766)	(623,409)
Total shareholders’ equity	137,466	74,149
Total liabilities and shareholders’ equity	$ 180,813	$ 126,241