Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Sep. 30, 2016
Current assets:
Cash and cash equivalents	$ 68,605	$ 63,905
Restricted cash	193	965
Accounts receivable, net of allowance of $13 and $36, respectively	17,411	18,432
Inventory	26,348	24,150
Prepaid expenses and other current assets	5,218	3,764
Total current assets	117,775	111,216
Property, plant, and equipment, net	14,203	12,213
Non-current inventory	3,330	3,531
Other non-current assets, net of allowance of $0	380	251
Total assets	135,688	127,211
Current liabilities:
Accounts payable	11,721	10,575
Accrued expenses and other current liabilities	8,675	7,684
Total current liabilities	20,396	18,259
Asset retirement obligations	1,605	1,573
Other long-term liabilities	57	62
Total liabilities	22,058	19,894
Commitments and contingencies (Note 12)
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; 33,737 shares issued and 26,827 shares outstanding as of March 31, 2017; 33,154 shares issued and 26,244 shares outstanding as of September 30, 2016	728,572	725,880
Treasury stock at cost; 6,910 shares	(47,721)	(47,721)
Accumulated other comprehensive income	595	579
Accumulated deficit	(567,816)	(571,421)
Total shareholders’ equity	113,630	107,317
Total liabilities and shareholders’ equity	$ 135,688	$ 127,211