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Composition of Certain Financial Statement Captions (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Inventories [Abstract]      
Raw materials $ 1,315,000 $ 1,384,000  
Work in process 232,000 404,000  
Finished goods 2,147,000 1,387,000  
Inventory, net 3,694,000 3,175,000  
Other Current Assets [Abstract]      
Prepaid insurance 264,000 291,000  
Prepaid other 850,000 759,000  
Other receivables 111,000 111,000  
Other current assets, net 1,225,000 1,161,000  
Property and Equipment, net [Abstract]      
Manufacturing and Development Equipment 5,059,000 5,250,000  
Office and computer equipment 2,274,000 2,266,000  
Leasehold improvements 3,271,000 3,267,000  
Property and Equipment, Gross 10,604,000 10,783,000  
Less accumulated depreciation and amortization (9,550,000) (8,609,000)  
Property and Equipment, net 1,054,000 2,174,000  
Depreciation expense 1,581,000 741,000 618,000
Other Assets [Abstract]      
Deposits 479,000 401,000  
Prepaid supplies, long-term 2,333,000 2,339,000  
Total Other Assets 2,812,000 2,740,000  
Accounts Payable and Accrued Expenses [Abstract]      
Accrued legal fees 564,000 826,000  
Accrued R&D studies 376,000 896,000  
Accounts payable 965,000 1,579,000  
Accrued vacation 918,000 873,000  
Accrued bonus 759,000 846,000  
Accrued expenses 2,167,000 2,071,000  
Deferred rent 138,000 35,000  
Accrued accounting fees 140,000 190,000  
Accrued payroll 50,000 95,000  
Accounts Payable and Accrued Expenses, Total $ 6,077,000 $ 7,411,000