Condensed Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Jun. 30, 2021	Sep. 30, 2020
Current assets:
Cash and cash equivalents	$ 67,191	$ 30,390
Restricted cash	1,106	148
Accounts receivable, net of credit loss of $192 and $227, respectively	31,536	25,324
Contract assets	220	1,566
Inventory	33,362	25,525
Prepaid expenses and other current assets	6,295	5,589
Assets held for sale	1,404	1,568
Total current assets	141,114	90,110
Property, plant, and equipment, net	21,847	21,052
Goodwill	69	69
Operating lease right-of-use assets	13,744	14,566
Other intangible assets, net	175	202
Other non-current assets	243	242
Total assets	177,192	126,241
Current liabilities:
Accounts payable	19,184	16,484
Accrued expenses and other current liabilities	9,961	11,577
Operating lease liabilities - current	1,153	992
Total current liabilities	30,298	29,053
PPP liability - non-current	0	6,488
Operating lease liabilities - non-current	12,954	13,735
Asset retirement obligations	2,040	2,022
Other long-term liabilities	794	794
Total liabilities	46,086	52,092
Commitments and contingencies
Shareholders’ equity:
Common stock, no par value, 50,000 shares authorized; 43,787 shares issued and 36,881 shares outstanding as of June 30, 2021; 36,461 shares issued and 29,551 shares outstanding as of September 30, 2020	780,776	744,361
Treasury stock at cost; 6,906 shares as of June 30, 2021 and 6,910 shares as of September 30, 2020	(47,721)	(47,721)
Accumulated other comprehensive income	892	918
Accumulated deficit	(602,841)	(623,409)
Total shareholders’ equity	131,106	74,149
Total liabilities and shareholders’ equity	$ 177,192	$ 126,241