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BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 122,493 $ 17,399
Short-term investments available-for-sale 23,917 26,712
Restricted cash 124 986
Accounts receivables 1,911 1,011
Unbilled receivables 3,194 1,570
Prepaid expenses 3,016 2,559
Other current assets 365 171
Total current assets 155,020 50,408
Investments available-for-sale    6,233
Property and equipment, net 13,969 11,456
Intangibles, net 16,405   
Goodwill 58,759 33,141
Restricted cash 757 756
Other non-current assets 164 351
Total assets 245,074 102,345
Current liabilities:    
Accounts payable 3,339 3,228
Accrued expenses and other current liabilities 9,553 7,275
Deferred revenue 190 258
Current portion of capital leases 115 58
Current portion of notes payable 597 157
Warrant liability    267
Deferred rent 466 432
Total current liabilities 14,260 11,675
Deferred revenue 2,500 2,500
Non-current portion of capital leases 222 237
Non-current portion of notes payable 1,653 753
Deferred rent 8,287 6,940
Other non-current liabilities 1,578   
Total liabilities 28,500 22,105
Commitments and contingencies      
Stockholders' equity:    
Preferred stock, $0.01 par value, 2,000,000 shares authorized; no shares issued and outstanding      
Common stock, $0.01 par value, 300,000,000 shares authorized at September 30, 2013 and 200,000,000 shares authorized at December 31, 2012; and 208,965,169 shares issued and 208,509,739 shares outstanding at September 30, 2013 and 148,398,747 shares issued and 147,943,317 shares outstanding at December 31, 2012 2,090 1,484
Additional paid-in capital 611,913 438,939
Accumulated deficit (396,092) (358,163)
Treasury stock, 455,430 shares, cost basis (2,450) (2,450)
Accumulated other comprehensive income 1,113 430
Total stockholders' equity 216,574 80,240
Total liabilities and stockholders' equity $ 245,074 $ 102,345