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Consolidated Balance Sheets and Statements of Operations and Comprehensive Income (Loss) Components (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Prepaid expenses and other current assets:
Inventory	$ 567,000	$ 252,000
Interest receivable	382,000	263,000
Prepaid expenses and other assets	722,000	847,000
Total	1,671,000	1,362,000
Property and equipment:
Property and equipment, gross	4,609,000	4,786,000
Less: Accumulated depreciation and amortization	(3,903,000)	(3,548,000)
Property and equipment, net	706,000	1,238,000
Equipment, furniture and fixtures and leasehold improvements
Property and equipment:
Property and equipment, gross	3,923,000	4,135,000
Acquired software
Property and equipment:
Property and equipment, gross	686,000	651,000
Testing equipment purchased through capital leases
Property and equipment:
Property and equipment, gross	$ 198,000

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