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Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Current Assets:    
Cash and cash equivalents $ 72,287 $ 53,506
Prepaid expenses and other current assets 638 584
Total Current Assets 72,925 54,090
Property and equipment, net 2,882 1,752
Other long-term assets 130 130
Total Assets 75,937 55,972
Current Liabilities:    
Accounts payable 1,264 1,912
Accrued expenses 4,703 1,750
Convertible notes payable to related parties, net of discount 1,025 492
Total Current Liabilities 6,992 4,154
Stockholders' Equity:    
Preferred stock, 2,500 shares authorized; none issued or outstanding at December 31, 2013 and 2012 0 0
Common stock, $0.01 par value, 75,000 shares authorized; 23,572 shares and 15,111 shares issued and outstanding at December 31, 2013 and 2012, respectively 237 152
Additional paid-in capital 307,578 235,253
Accumulated deficit (238,870) (183,587)
Total Stockholders' Equity 68,945 51,818
Total Liabilities and Stockholders' Equity $ 75,937 $ 55,972