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Condensed Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 45,722 $ 53,506
Prepaid expenses and other current assets 427 584
Total current assets 46,149 54,090
Property and equipment, net 2,700 1,752
Other long-term assets 130 130
Total assets 48,979 55,972
Current liabilities:    
Accounts payable 3,825 1,912
Accrued expenses 3,149 1,750
Convertible notes payable to related parties, net of discount 622 492
Total current liabilities 7,596 4,154
Stockholders' equity:    
Common stock 3,058 3,024
Additional paid-in capital 234,865 232,381
Accumulated deficit (196,540) (183,587)
Total stockholders' equity 41,383 51,818
Total liabilities and stockholders' equity $ 48,979 $ 55,972