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Condensed Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Income Statement [Abstract]    
Revenue - related party $ 1,822 $ 1,822
Revenue 2,883 2,973
Total revenue 4,705 4,795
Cost of revenue 3,960 4,148
Gross profit 745 647
Operating expenses:    
Research and development 1,320 1,154
Selling, general and administrative 1,206 1,091
Gain on sale of asset   (514)
Total operating expenses 2,526 1,731
Loss from operations (1,781) (1,084)
Other income (expense):    
Amortization of deferred financing costs and debt discount (536) (709)
Interest expense - related party   (226)
Interest expense (44) (50)
Derivative fair value adjustment 2,783   
Other expense (10)  
Total other income (expense): 2,193 (985)
Net income (loss) 412 (2,069)
Deemed dividend for beneficial conversion feature on Series D-2 preferred stock (909)   
Deemed dividend for antidilution adjustments to convertible preferred stock (214)   
Accretion of convertible preferred stock (510)   
Net loss attributable to common stockholders $ (1,221) $ (2,069)
Per share information:    
Net loss per common share, basic $ (3.65) $ (6.16)
Net loss per common share, diluted $ (6.57) $ (6.16)