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Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 171,526 $ 72,675
Prepaid expenses and other current assets 1,895 1,057
Total current assets 173,421 73,732
Property and equipment, net 2,905 2,820
Other long-term assets 130 130
Total assets 176,456 76,682
Current liabilities:    
Accounts payable 2,987 2,549
Accrued clinical liabilities 6,342 3,811
Accrued payroll and employee-related liabilities 2,284 2,731
Other accrued expenses 3,074 2,931
Convertible notes payable to related parties, net of discount 1,903 1,598
Total current liabilities 16,590 13,620
Stockholders’ equity:    
Common stock 356 292
Additional paid-in capital 518,424 378,007
Accumulated deficit (358,914) (315,237)
Total stockholders’ equity 159,866 63,062
Total liabilities and stockholders’ equity $ 176,456 $ 76,682