Consolidated Balance Sheets (USD $)
Dec. 31, 2013
Dec. 31, 2012
Current assets:    
Cash $ 150,081 $ 127,385
Accounts receivable, net 567,523 365,845
Other receivables 21,378 121,990
Inventory, net 786,636 995,713
Prepaid expenses and other current assets 317,510 420,108
Assets of discontinued operations   10,896
Total current assets 1,843,128 2,041,937
Property and equipment, net 13,854 46,877
Patents, net 1,244,712 1,329,046
Other assets, net 163,711 183,258
Assets of discontinued operations – long-term 200,000 200,000
Total assets 3,465,405 3,801,118
Current liabilities:    
Accounts payable 4,199,511 3,329,537
Accrued liabilities 89,730 488,956
Accrued warranty 344,990 329,680
Common stock warrant liability 0 9
Credit facility 500,000  
Capital lease obligations – current portion 299 4,385
Derivative liability – embedded conversion feature 177,927  
Current portion of long-term debt 129,839  
Convertible notes – short-term 60,000  
Liabilities of discontinued operations 967,928 1,052,819
Total current liabilities 6,470,224 5,205,386
Capital lease obligations, less current portion   328
Convertible notes, less current portion (net of discount) 382,084  
Total liabilities 6,852,308 5,205,714
Commitments and contingencies (Note 17) 0 0
Common stock, $0.001 par value; 500,000,000 shares authorized; 116,339,293 and 26,924,643 shares issued and outstanding at December 31, 2013 and 2012, respectively (Note 1) 116,339 26,925
Additional paid-in capital 78,717,997 76,455,054
Accumulated deficit (83,390,026) (79,611,493)
Total stockholders’ deficit (4,409,466) (2,388,343)
Total liabilities, redeemable convertible preferred stock and stockholders’ deficit 3,465,405 3,801,118
Redeemable Convertible Preferred Stock [Member] | Series C Preferred Stock [Member]
    
Current liabilities:    
Convertible redeemable preferred stock 163,998 983,747
Redeemable Convertible Preferred Stock [Member] | Series D Preferred Stock [Member]
    
Current liabilities:    
Convertible redeemable preferred stock 858,565  
Redeemable Convertible Preferred Stock [Member] | Series B Preferred Stock [Member]
    
Current liabilities:    
Series B convertible redeemable preferred stock, $0.001 par value; 467 and 2,243 shares issued and outstanding on December 31, 2013 and 2012, respectively $ 146,224 $ 741,171