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Consolidated Balance Sheets (Current Period Unaudited) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Collaboration Receivables [Member]    
Assets    
Receivables $ 7,384 $ 6,243
Deferred Collaborative Revenue [Member]    
Liabilities and Stockholders’ Equity    
Deferred revenue 2,163 2,163
Cash and cash equivalents 12,902 28,899
Restricted cash 1,965 1,612
Investments 22,914 22,664
Inventory 1,949 1,612
Prepaid expenses and other current assets 3,221 2,674
Deferred collaboration expense 90 90
Total current assets 50,425 63,794
Investments 41,134 47,683
Property and equipment, net 8,362 5,149
Deferred collaboration expense 246 265
Other assets 2,714 5,468
Total assets 102,881 122,359
Accounts payable 7,691 9,307
Accrued expenses 17,328 16,237
Interest payable 7,974 6,746
Non-recourse notes payable 27,914 27,804
Total current liabilities 63,070 62,257
Deferred collaboration revenue 9,194 9,674
Deferred rent 313 329
Lease financing obligation $ 2,506 $ 2,375
Stockholders’ equity:    
Preferred stock, $0.001 par value; shares authorized — 5,000; no shares issued and outstanding
Common stock, $0.01 par value: shares authorized — 200,000; shares issued and outstanding — 73,693 in 2016 and 73,355 in 2015 $ 737 $ 734
Additional paid-in capital 560,762 558,113
Accumulated other comprehensive income (loss) 48 (206)
Accumulated deficit (533,749) (510,917)
Total stockholders’ equity 27,798 47,724
Total liabilities and stockholders’ equity $ 102,881 $ 122,359