Condensed Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Mar. 31, 2021	Sep. 30, 2020
Current assets:
Cash and cash equivalents	$ 63,728	$ 30,390
Restricted cash	1,553	148
Accounts receivable, net of credit loss of $175 and $227, respectively	29,836	25,324
Contract assets	685	1,566
Inventory	29,747	25,525
Prepaid expenses and other current assets	4,598	5,589
Assets held for sale	1,983	1,568
Total current assets	132,130	90,110
Property, plant, and equipment, net	19,180	21,052
Goodwill	69	69
Operating lease right-of-use assets	14,171	14,566
Other intangible assets, net	184	202
Other non-current assets	217	242
Total assets	165,951	126,241
Current liabilities:
PPP liability - current	1,912	0
Accounts payable	15,746	16,484
Accrued expenses and other current liabilities	10,068	11,577
Operating lease liabilities - current	1,183	992
Total current liabilities	28,909	29,053
PPP liability - non-current	4,576	6,488
Operating lease liabilities - non-current	13,222	13,735
Asset retirement obligations	2,049	2,022
Other long-term liabilities	794	794
Total liabilities	49,550	52,092
Commitments and contingencies
Shareholders’ equity:
Common stock, no par value, 50,000 shares authorized; 43,681 shares issued and 36,775 shares outstanding as of March 31, 2021; 36,461 shares issued and 29,551 shares outstanding as of September 30, 2020	779,681	744,361
Treasury stock at cost; 6,906 shares	(47,721)	(47,721)
Accumulated other comprehensive income	897	918
Accumulated deficit	(616,456)	(623,409)
Total shareholders’ equity	116,401	74,149
Total liabilities and shareholders’ equity	$ 165,951	$ 126,241
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Treasury stock, shares held (in shares)	6,906,000	6,906,000