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Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 152,989 $ 72,675
Prepaid expenses and other current assets 2,006 1,057
Total current assets 154,995 73,732
Property and equipment, net 2,982 2,820
Other long-term assets 174 130
Total assets 158,151 76,682
Current liabilities:    
Accounts payable 2,735 2,549
Accrued clinical liabilities 5,167 3,811
Accrued payroll and employee-related liabilities 3,389 2,731
Other accrued expenses 3,098 2,931
Convertible notes payable to related parties, net of discount 2,061 1,598
Total current liabilities 16,450 13,620
Stockholders’ equity:    
Common stock 359 292
Additional paid-in capital 522,928 378,007
Accumulated deficit (381,586) (315,237)
Total stockholders’ equity 141,701 63,062
Total liabilities and stockholders’ equity $ 158,151 $ 76,682