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CONSOLIDATED BALANCE SHEETS (USD $)
Sep. 30, 2011
Dec. 31, 2010
Current assets:  
Cash and cash equivalents$ 18,141,139$ 30,094,162
Accounts receivable, net of allowance of $1,923,810 and $974,887 at September 30, 2011 and December 31, 2010, respectively55,830,65373,713,308
Unbilled contract costs and fees174,342174,342
Inventory81,331,47040,542,893
Note receivable4,224,393 
Prepaid expenses and other current assets5,014,9494,254,246
Total current assets164,716,946148,778,951
Property and equipment, net11,100,3097,284,285
Other long-term assets676,990 
Total assets176,494,245156,063,236
Current liabilities:  
Line of credit34,675,00015,000,000
Accounts payable58,556,34945,060,537
Accrued payroll and payroll related expenses2,518,5744,476,685
Other accrued expenses6,094,1516,824,388
Accrued contract loss293,749 
Accrued restructuring costs584,94749,203
Note payable, current portion, net of discount of $365,267 and $434,247 at September 30, 2011 and December 31, 2010, respectively3,737,5342,107,473
Current portion of subordinated convertible notes8,380,952 
Current portion of deferred revenue3,330,0348,099,852
Total current liabilities118,171,29081,618,138
Warrant liabilities272,1065,454,109
Note payable, net of current portion and discount of $184,180 and $399,589 at September 30, 2011 and December 31, 2010, respectively6,149,3789,058,691
Long-term subordinated convertible notes, net of current portion6,869,048 
Deferred revenue, net of current portion20,901,77811,622,918
Other long-term liabilities703,205318,151
Total liabilities153,066,805108,072,007
Commitments and contingencies (Note I)  
Stockholders' equity:  
Preferred stock; $0.01 par value 1,000,000 shares authorized, 0 shares issued and outstanding at September 30, 2011 and December 31, 2010, respectively  
Common stock; $0.01 par value, 200,000,000 shares authorized; 119,769,317 and 117,911,278 shares issued and outstanding at September 30, 2011 and December 31, 2010, respectively1,197,6931,179,113
Additional paid-in capital302,591,358291,717,323
Accumulated deficit(278,932,043)(243,475,639)
Accumulated other comprehensive loss(1,429,568)(1,429,568)
Total stockholders' equity23,427,44047,991,229
Total liabilities and stockholders' equity$ 176,494,245$ 156,063,236