Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Sep. 30, 2016
Current assets:
Cash and cash equivalents	$ 62,181	$ 63,905
Restricted cash	562	965
Accounts receivable, net of allowance of $33 and $36, respectively	21,029	18,432
Inventory	28,198	24,150
Prepaid expenses and other current assets	3,564	3,764
Total current assets	115,534	111,216
Property, plant, and equipment, net	14,043	12,213
Non-current inventory	3,565	3,531
Other non-current assets, net of allowance of $0	257	251
Total assets	133,399	127,211
Current liabilities:
Accounts payable	14,806	10,575
Accrued expenses and other current liabilities	7,331	7,684
Total current liabilities	22,137	18,259
Asset retirement obligations	1,590	1,573
Other long-term liabilities	60	62
Total liabilities	23,787	19,894
Commitments and contingencies (Note 11)
Shareholders’ equity:
Preferred stock, $0.0001 par value, 5,882 shares authorized; none issued or outstanding	0	0
Common stock, no par value, 50,000 shares authorized; 33,185 shares issued and 26,275 shares outstanding as of December 31, 2016; 33,154 shares issued and 26,244 shares outstanding as of September 30, 2016	726,678	725,880
Treasury stock at cost; 6,910 shares	(47,721)	(47,721)
Accumulated other comprehensive income	319	579
Accumulated deficit	(569,664)	(571,421)
Total shareholders’ equity	109,612	107,317
Total liabilities and shareholders’ equity	$ 133,399	$ 127,211