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Condensed Consolidated Statements of Cash Flows (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Cash flows provided by (used in) operating activities    
Net loss $ (4,543,284) $ (5,638,377)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 6,317 6,199
Share-based compensation expense 199,754 74,070
Changes in operating assets and liabilities:    
Accounts receivable 168,531 69,517
Prepaid expenses and other assets 108,247 41,895
Accounts payable (1,252,288) 3,362,141
Accrued liabilities (1,670,114) 209,854
Deferred revenue   (416,664)
Net cash used in operating activities (6,982,837) (2,291,365)
Cash flows provided by (used in) investing activities    
Maturities of investments   1,541,938
Purchase of property and equipment (3,120) (5,055)
Net cash (used in) provided by investing activities (3,120) 1,536,883
Cash flows provided by (used in) financing activities    
Gross proceeds of public offering 116,191,285  
Payment of costs of public offering (738,005)  
Net cash provided by financing activities 115,453,280  
Net increase (decrease) in cash and cash equivalents 108,467,323 (754,482)
Cash and cash equivalents at beginning of period 35,150,924 15,645,528
Cash and cash equivalents at end of period 143,618,247 14,891,046
Cash paid for interest 5,041  
Cash paid for taxes $ 3,900 $ 800