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Consolidated Balance Sheets (Current Period Unaudited) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Assets    
Cash and cash equivalents $ 43,767 $ 50,282
Restricted cash 4,599 3,286
Investments 47,540 64,115
Receivables from collaborations 5,694 6,117
Inventory 7
Prepaid expenses and other current assets 2,397 1,381
Deferred collaboration expense 152 210
Total current assets 104,156 125,391
Investments 41,599 41,295
Property and equipment, net 9,395 9,546
Other assets 222 2,027
Total assets 155,372 178,259
Liabilities and Stockholders’ Equity    
Accounts payable 3,588 6,337
Accrued expenses 15,624 12,699
Interest payable 13,465 12,095
Deferred collaboration revenue 7,300 8,484
Lease financing obligation 76 75
Senior credit facility 6,497 6,464
Non-recourse notes payable 28,792 28,682
Total current liabilities 75,342 74,836
Deferred rent 131 155
Lease financing obligation 2,731 2,751
Senior credit facility 15,114 16,750
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 — 98,702 in 2018 and 98,411 in 2017 987 984
Additional paid-in capital 718,037 714,869
Accumulated other comprehensive loss (476) (243)
Accumulated deficit (656,494) (631,843)
Total stockholders’ equity 62,054 83,767
Total liabilities and stockholders’ equity $ 155,372 $ 178,259