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Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Current assets:    
Cash and cash equivalents $ 68,016,000 $ 75,180,000
Short-term investments 32,391,000 $ 55,986,000
Inventory 2,744,000
Prepaid expenses and other current assets 5,050,000 $ 3,585,000
Total current assets 108,201,000 134,751,000
Property and equipment, net $ 3,645,000 3,049,000
Other assets 45,000
Total assets $ 111,846,000 137,845,000
Current liabilities:    
Accounts payable 6,861,000 3,300,000
Accrued clinical liabilities 3,735,000 5,231,000
Accrued payroll and employee liabilities 2,969,000 4,828,000
Other accrued liabilities 3,217,000 4,154,000
Convertible notes payable to related parties, net of discount 2,388,000 2,222,000
Total current liabilities 19,170,000 19,735,000
Stockholders’ equity:    
Common stock 363,000 361,000
Additional paid-in capital 538,585,000 530,617,000
Accumulated other comprehensive income (loss) 1,000 (40,000)
Accumulated deficit (446,273,000) (412,828,000)
Total stockholders’ equity 92,676,000 118,110,000
Total liabilities and stockholders’ equity $ 111,846,000 $ 137,845,000