Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Sep. 30, 2015
Current assets:
Cash and cash equivalents	$ 115,520	$ 111,885
Restricted cash	1,103	375
Accounts receivable, net of allowance of $325 and $462, respectively	14,430	17,319
Inventory	14,871	17,130
Prepaid expenses and other current assets	4,313	4,976
Total current assets	150,237	151,685
Property, plant, and equipment, net	9,730	8,925
Other non-current assets, net of allowance of $0 and $3,561, respectively	245	297
Total assets	160,212	160,907
Current liabilities:
Accounts payable	6,915	7,189
Deferred gain associated with sale of assets	3,400	3,400
Accrued expenses and other current liabilities	11,494	13,102
Total current liabilities	21,809	23,691
Asset retirement obligations	1,525	1,774
Total liabilities	$ 23,334	$ 25,465
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; 32,624 shares issued and 25,714 shares outstanding as of December 31, 2015; 32,586 shares issued and 25,676 shares outstanding as of September 30, 2015	762,540	762,003
Treasury stock at cost; 6,910 shares	(47,721)	(47,721)
Accumulated other comprehensive income	759	847
Accumulated deficit	(578,700)	(579,687)
Total shareholders’ equity	136,878	135,442
Total liabilities and shareholders’ equity	$ 160,212	$ 160,907