Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Sep. 30, 2018
Current assets:
Cash and cash equivalents	$ 20,503	$ 63,117
Restricted cash	158	78
Accounts receivable, net of allowance of $295 and $548, respectively	18,451	19,275
Inventory	31,123	20,850
Prepaid expenses and other current assets	17,169	12,730
Total current assets	87,404	116,050
Property, plant, and equipment, net	37,231	18,216
Goodwill	798	0
Other intangible assets, net	250	0
Non-current inventory	912	1,433
Other non-current assets	61	199
Total assets	126,656	135,898
Current liabilities:
Accounts payable	10,615	12,997
Accrued expenses and other current liabilities	23,462	14,205
Total current liabilities	34,077	27,202
Asset retirement obligations	1,850	1,809
Other long-term liabilities	122	82
Total liabilities	36,049	29,093
Commitments and contingencies (Note 13)
Shareholders’ equity:
Common stock, no par value, 50,000 shares authorized; 35,670 shares issued and 28,760 shares outstanding as of June 30, 2019; 34,487 shares issued and 27,577 shares outstanding as of September 30, 2018	738,841	734,066
Treasury stock at cost; 6,910 shares	(47,721)	(47,721)
Accumulated other comprehensive income	921	885
Accumulated deficit	(601,434)	(580,425)
Total shareholders’ equity	90,607	106,805
Total liabilities and shareholders’ equity	$ 126,656	$ 135,898