CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
ASSETS
Cash and cash equivalents	$ 219,506	$ 176,225
Accounts receivable	313	7,500
Unbilled revenue/reimbursement	5	1,001
Contract assets	1,042	3,631
Non-cash royalty receivable	14,079	15,116
Prepaid and other current assets	6,426	5,425
Total current assets	241,371	208,898
Property and equipment, net of accumulated depreciation	5,902	6,993
Operating lease right-of-use assets	14,864	15,587
Other assets	7,591	3,784
Total assets	269,728	235,262
LIABILITIES AND SHAREHOLDERS DEFICIT
Accounts payable	12,739	9,933
Accrued compensation	4,321	8,991
Other accrued liabilities	15,363	13,932
Current portion of liability related to the sale of future royalties, net of deferred financing costs of $470 and $635, respectively	55,213	41,274
Current portion of operating lease liability	3,163	2,971
Current portion of deferred revenue	80	309
Total current liabilities	90,879	77,410
Deferred revenue, net of current portion	126,535	127,123
Operating lease liability, net of current portion	20,171	21,798
Convertible 4.5% senior notes, net of deferred financing costs of $15 and $22, respectively	2,085	2,078
Liability related to the sale of future royalties, net of current portion and deferred financing costs of $699 and $859, respectively	51,994	82,267
Other long-term liabilities	2,587	707
Total liabilities	294,251	311,383
Commitments and contingencies (Note I)
Shareholders deficit:
Preferred stock, $.01 par value; authorized 5,000 shares; no shares issued and outstanding as of June 30, 2020 and December 31, 2020
Common stock, $.01 par value; authorized 300,000 shares; issued and outstanding 174,540 and 150,136 shares as of June 30, 2020 and December 31, 2019, respectively	1,745	1,501
Additional paid-in capital	1,314,586	1,209,846
Accumulated deficit	(1,340,854)	(1,287,468)
Total shareholders deficit	(24,523)	(76,121)
Total liabilities and shareholders deficit	$ 269,728	$ 235,262