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Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)
Jun. 30, 2016
Dec. 31, 2015
Current assets:    
Cash and cash equivalents $ 61,943,000 $ 75,180,000
Short-term investments 12,700,000 55,986,000
Inventory 3,312,000
Prepaid expenses and other current assets 3,175,000 3,585,000
Total current assets 81,130,000 134,751,000
Property and equipment, net 4,471,000 3,049,000
Other assets 130,000 45,000
Total assets 85,731,000 137,845,000
Current liabilities:    
Accounts payable 8,661,000 3,300,000
Accrued clinical liabilities 9,485,000 5,231,000
Accrued payroll and employee liabilities 4,674,000 4,828,000
Other accrued liabilities 2,512,000 4,154,000
Convertible notes payable to related parties, net of discount 2,558,000 2,222,000
Total current liabilities 27,890,000 19,735,000
Stockholders’ equity:    
Common stock 390,000 361,000
Additional paid-in capital 546,951,000 530,617,000
Accumulated other comprehensive loss (1,000) (40,000)
Accumulated deficit (489,499,000) (412,828,000)
Total stockholders’ equity 57,841,000 118,110,000
Total liabilities and stockholders’ equity $ 85,731,000 $ 137,845,000