Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Assets
Cash and cash equivalents	$ 173,468	$ 114,172
Restricted cash	2,188	1,551
Investments	15,935	22,054
Receivables from collaborations	3,997	22,146
Inventories	5,233	0
Prepaid expenses and other current assets	3,016	4,422
Total current assets	203,837	164,345
Property and equipment, net	7,149	7,347
Other assets	3,720	3,590
Total assets	214,706	175,282
Liabilities and Stockholders’ Equity
Accounts payable	9,354	13,988
Accrued expenses	24,843	21,365
Interest payable	17,806	14,904
Deferred collaboration revenue	715	2,120
Lease financing obligation	1,096	1,377
Senior credit facility	19,056	9,020
Non-recourse notes payable	29,780	29,561
Total current liabilities	102,650	92,335
Lease financing obligation	3,834	3,406
Senior credit facility	31,715	41,289
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 - 450,000; shares issued and outstanding – 176,429 in 2020 and 154,082 in 2019	1,764	1,541
Additional paid-in capital	991,574	877,300
Accumulated other comprehensive income	3	39
Accumulated deficit	(916,834)	(840,628)
Total stockholders’ equity	76,507	38,252
Total liabilities and stockholders’ equity	$ 214,706	$ 175,282