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Consolidated Balance Sheets (Current Period Unaudited) - USD ($)
Jun. 30, 2015
Dec. 31, 2014
Collaboration Receivables [Member]    
Assets    
Receivables $ 4,296,000 $ 3,849,000
Trade Accounts Receivable [Member]    
Assets    
Receivables   5,641,000
Deferred Collaborative Revenue [Member]    
Liabilities and Stockholders’ Equity    
Deferred revenue $ 6,453,000 1,481,000
Deferred Product Sales [Member]    
Liabilities and Stockholders’ Equity    
Deferred revenue 46,000 5,605,000
Cash and cash equivalents 76,781,000 54,540,000
Restricted cash 1,569,000 150,000
Investments 17,584,000 18,232,000
Inventory 1,308,000 683,000
Prepaid expenses and other current assets 5,449,000 6,172,000
Deferred collaboration expense 101,000 76,000
Total current assets 107,088,000 89,343,000
Investments 36,059,000 41,116,000
Furniture and equipment, net 1,047,000 207,000
Deferred collaboration expense 288,000 177,000
Other assets 5,699,000 6,031,000
Total assets 150,181,000 136,874,000
Accounts payable 3,822,000 2,849,000
Accrued expenses 19,001,000 11,329,000
Interest payable 4,450,000 6,029,000
Non-recourse notes payable 30,000,000 30,000,000
Total current liabilities 63,772,000 57,293,000
Deferred collaboration revenue 9,959,000 3,552,000
Deferred rent 361,000 394,000
Stockholders’ equity:    
Preferred stock, $0.001 par value; shares authorized — 5,000; no shares issued and outstanding 0 0
Common stock, $0.01 par value: shares authorized — 200,000; shares issued and outstanding — 73,168 in 2015 and 71,955 in 2014 732,000 720,000
Additional paid-in capital 553,610,000 542,943,000
Accumulated other comprehensive loss (92,000) (130,000)
Accumulated deficit (478,161,000) (467,898,000)
Total stockholders’ equity 76,089,000 75,635,000
Total liabilities and stockholders’ equity $ 150,181,000 $ 136,874,000