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Consolidated Statements of Operations (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Statements Of Operations [Abstract]      
Net revenues $ 3,717 $ 7,137 $ 6,067
Cost of revenues 1,642 1,465 908
Gross margin 2,075 5,672 5,159
Operating expenses:      
Research and development 7,235 5,741 1,858
Sales and marketing 2,732 4,372 1,812
General and administrative 5,079 4,721 3,533
Total operating expenses 15,046 14,834 7,203
Operating loss (12,971) (9,162) (2,044)
Other expense:      
Interest and other expense       (288)
Non-cash items related to debt discounts and deferred financing fees and the valuation of conversion features and warrants       (14,735)
Total other expense       (15,023)
Loss before provision for income taxes (12,971) (9,162) (17,067)
Provision for income taxes 109 125 78
Net loss $ (13,080) $ (9,287) $ (17,145)
Loss per common share:      
Basic and diluted loss per share $ (0.37) $ (0.28) $ (0.64)
Basic and diluted - weighted average number of common shares outstanding 35,266 33,003 26,784