Consolidated Balance Sheets - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Convertible Common Stock [Member]
Stockholders’ equity
Common Stock, Value	$ 0	$ 0
Cash and cash equivalents	6,966,000	18,430,000
Accounts receivable, net of allowance for doubtful accounts of $100 and $172 at December 31, 2015 and December 31, 2014, respectively	5,027,000	5,335,000
Inventories	7,227,000	13,844,000
Prepaid expenses and other current assets	$ 2,286,000	2,721,000
Assets held for sale		335,000
Total current assets	$ 21,506,000	40,665,000
Equipment and furniture	191,046,000	190,718,000
Leasehold improvements	46,887,000	46,850,000
Projects in process	1,447,000	1,415,000
	239,380,000	238,983,000
Less accumulated depreciation and amortization	229,140,000	221,812,000
	10,240,000	17,171,000
Other assets	90,000	180,000
	31,836,000	58,016,000
Accounts payable	3,490,000	5,913,000
Accrued liabilities	$ 3,399,000	3,419,000
Accrued restructuring costs		904,000
Bank borrowings	$ 2,500,000	4,000,000
Total current liabilities	$ 9,389,000	14,236,000
Other long-term liabilities		$ 1,122,000
Commitments and contingencies
Preferred stock, $0.01 par value, 5,000 shares authorized, none issued or outstanding
Common Stock, Value	$ 898,000	$ 869,000
Additional paid-in capital	645,936,000	642,683,000
Accumulated deficit	(624,125,000)	(600,635,000)
Treasury stock at cost: 123 and 115 shares at December 31, 2015 and 2014, respectively	(262,000)	(259,000)
Total stockholders’ equity	22,447,000	42,658,000
	$ 31,836,000	$ 58,016,000