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Composition of Certain Financial Statement Captions (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Inventories [Abstract]      
Raw materials $ 1,384,000 $ 1,503,000  
Work in process 404,000 790,000  
Finished goods 1,387,000 1,025,000  
Inventory, net 3,175,000 3,318,000  
Other Current Assets [Abstract]      
Prepaid insurance 291,000 234,000  
Prepaid other 759,000 372,000  
Other Receivables 111,000 231,000  
Other current assets, net 1,161,000 837,000  
Property and Equipment, net [Abstract]      
Manufacturing and Development Equipment 5,250,000 4,268,000  
Office and computer equipment 2,266,000 2,177,000  
Leasehold improvements 3,267,000 3,255,000  
Property and Equipment, Gross 10,783,000 9,700,000  
Less accumulated depreciation and amortization (8,609,000) (7,989,000)  
Property and Equipment, net 2,174,000 1,711,000  
Depreciation expense 741,000 618,000 710,000
Other Assets [Abstract]      
Deposits 401,000 415,000  
Prepaid supplies, long-term 2,339,000 1,357,000  
Total Other Assets 2,740,000 1,772,000  
Accounts Payable and Accrued Expenses [Abstract]      
Accrued legal fees 826,000 829,000  
Accrued R&D studies 896,000 534,000  
Accounts payable 1,579,000 272,000  
Accrued vacation 873,000 908,000  
Accrued bonus 846,000 866,000  
Accrued expenses 2,071,000 1,572,000  
Deferred rent 35,000 37,000  
Accrued accounting fees 190,000 90,000  
Accrued payroll 95,000 226,000  
Accounts Payable and Accrued Expenses, Total $ 7,411,000 $ 5,334,000