CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
ASSETS
Cash and cash equivalents	$ 247,299	$ 176,225
Accounts receivable	54	7,500
Unbilled revenue/reimbursement	1,753	1,001
Contract asset	990	3,631
Non-cash royalty receivable	12,977	15,116
Prepaid and other current assets	7,653	5,425
Total current assets	270,726	208,898
Property and equipment, net of accumulated depreciation	6,018	6,993
Operating lease right-of-use assets	15,234	15,587
Other assets	6,831	3,784
Total assets	298,809	235,262
LIABILITIES AND SHAREHOLDERS (DEFICIT) EQUITY
Accounts payable	9,534	9,933
Accrued compensation	5,211	8,991
Other accrued liabilities	18,916	13,932
Current portion of liability related to the sale of future royalties, net of deferred financing costs of $557 and $635, respectively	48,651	41,274
Current portion of operating lease liability	3,071	2,971
Current portion of deferred revenue	123	309
Total current liabilities	85,506	77,410
Deferred revenue, net of current portion	127,387	127,123
Operating lease liability - net of current portion	20,996	21,798
Convertible 4.5% senior notes, net of deferred financing costs of $18 and $22, respectively	2,082	2,078
Liability related to the sale of future royalties, net of current portion and deferred financing costs of $765 and $859, respectively	65,452	82,267
Other long-term liabilities	1,489	707
Total liabilities	302,912	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 March 31, 2020 and December 31, 2020
Common stock, $.01 par value; authorized 200,000 shares; issued and outstanding 174,261 and 150,136 shares as of March 31, 2020 and December 31, 2019, respectively	1,743	1,501
Additional paid-in capital	1,310,710	1,209,846
Accumulated deficit	(1,316,556)	(1,287,468)
Total shareholders? deficit	(4,103)	(76,121)
Total liabilities and shareholders? deficit	$ 298,809	$ 235,262