Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020
Current assets:
Cash and cash equivalents	$ 31,120	$ 30,390
Restricted cash	38	148
Accounts receivable, net of allowance of $234 and $227, respectively	27,276	25,324
Contract assets	582	1,566
Inventory	27,855	25,525
Prepaid expenses and other current assets	4,283	5,589
Assets held for sale	1,661	1,568
Total current assets	92,815	90,110
Property, plant, and equipment, net	20,558	21,052
Goodwill	69	69
Operating lease right-of-use assets	14,262	14,566
Other intangible assets, net	193	202
Other non-current assets	229	242
Total assets	128,126	126,241
Current liabilities:
PPP liability - current	1,093
Accounts payable	17,158	16,484
Accrued expenses and other current liabilities	9,650	11,577
Operating lease liabilities - current	979	992
Total current liabilities	28,880	29,053
PPP liability - non-current	5,395	6,488
Operating lease liabilities - non-current	13,481	13,735
Asset retirement obligations	2,041	2,022
Other long-term liabilities	794	794
Total liabilities	50,591	52,092
Commitments and contingencies (Note 11)
Shareholders' equity:
Common stock, no par value, 50,000 shares authorized; 36,693 shares issued and 29,783 shares outstanding as of December 31, 2020; 36,461 shares issued and 29,551 shares outstanding as of September 30, 2020	745,188	744,361
Treasury stock at cost; 6,910 shares	(47,721)	(47,721)
Accumulated other comprehensive income	908	918
Accumulated deficit	(620,840)	(623,409)
Total shareholders' equity	77,535	74,149
Total liabilities and shareholders' equity	$ 128,126	$ 126,241