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Condensed Consolidated Balance Sheets (Unaudited) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 26,463,625 $ 30,585,424
Trade receivables 100,388 108,815
Other receivables 111,965 486,222
Prepaid assets 413,416 530,037
Deferred financing costs, current 40,496 46,420
Other assets, current 83,702 83,537
Total current assets 27,213,592 31,840,455
Property, plant and equipment, net 5,274,600 5,304,684
Deferred financing costs, non-current 15,144 23,307
Other assets, non-current 413,717 413,717
Goodwill 2,147,426 2,139,294
Other intangible assets, net 1,765,658 1,835,717
Total assets 36,830,137 41,557,174
Current liabilities:    
Accounts payable 2,190,342 1,151,903
Accrued expenses and other current liabilities 2,230,808 4,067,916
Deferred revenue, current 61,202 67,245
Capital lease obligation, current 21,704 21,316
Deferred rent, current 47,231 34,366
Loan payable net of discount, current 3,747,236 3,664,370
Bonds payable, current 71,250 125,000
Total current liabilities 8,369,773 9,132,116
Capital lease obligations, non-current 23,848 29,422
Loan payable net of discount, non-current 12,096,683 9,244,874
Fair value of warrant liability 5,868,433 5,541,809
Other long-term liabilities 972,233 801,388
Deferred rent, non-current 1,782,654 1,790,943
Deferred revenue, non-current 58,704 62,910
Total liabilities 29,172,328 26,603,462
Commitments and contingencies (Note 7)      
Stockholders' equity:    
Common stock, $0.01 par value; 225,000,000 shares authorized; issued and outstanding 55,419,116 at March 31, 2014 and 55,138,311 at December 31, 2013 554,191 551,383
Additional paid-in capital 401,988,647 401,680,562
Accumulated deficit (395,150,590) (387,530,334)
Accumulated other comprehensive income 265,561 252,101
Total stockholders' equity 7,657,809 14,953,712
Total liabilities and stockholders' equity $ 36,830,137 $ 41,557,174