Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents	$ 52,584	$ 50,282
Restricted cash	1,506	3,286
Investments	67,737	64,115
Receivables from collaborations	3,394	6,117
Inventory	821
Prepaid expenses and other current assets	2,445	1,381
Deferred collaboration expense	8	210
Total current assets	128,495	125,391
Investments	29,157	41,295
Property and equipment, net	9,236	9,546
Other assets	1,420	2,027
Total assets	168,308	178,259
Liabilities and Stockholders’ Equity
Accounts payable	7,911	6,337
Accrued expenses	15,120	12,699
Interest payable	10,427	12,095
Deferred collaboration revenue	200	8,484
Lease financing obligation	66	75
Senior credit facility	1,621	6,464
Non-recourse notes payable	29,012	28,682
Total current liabilities	64,357	74,836
Deferred rent	81	155
Lease financing obligation	2,704	2,751
Senior credit facility	28,293	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 — 109,625 in 2018 and 98,411 in 2017	1,096	984
Additional paid-in capital	776,724	714,869
Accumulated other comprehensive loss	(410)	(243)
Accumulated deficit	(704,537)	(631,843)
Total stockholders’ equity	72,873	83,767
Total liabilities and stockholders’ equity	$ 168,308	$ 178,259