CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	[1]
Current assets:
Cash and cash equivalents	$ 138,417	$ 118,016
Short-term marketable securities	29,775	32,417
Related party receivables from collaborative arrangements	51,878	46,847
Prepaid expenses and other current assets	439	766
Total current assets	220,509	198,046
Property and equipment, net	249	368
Capitalized fees paid to a related party, net	170,177	180,545
Other assets	37	37
Total assets	390,972	378,996
Current liabilities:
Accounts payable	629	128
Accrued personnel-related expenses	1,647	2,361
Accrued interest payable	3,566	7,828
Other accrued liabilities	1,157	1,095
Current portion of long-term debt	25,000	7,752
Deferred revenue, current	885	885
Total current liabilities	32,884	20,049
Long-term debt, net of current portion, discount and issuance costs	578,449	708,341
Other long-term liabilities	1,049	1,383
Deferred revenue	1,551	2,214
Commitments and contingencies (Notes 9)
Stockholders' deficit:
Preferred stock: $0.01 par value, 230 shares authorized, no shares issued and outstanding
Common stock: $0.01 par value, 200,000 shares authorized, 108,152 and 108,585 shares issued as of September 30, 2017 and December 31, 2016, respectively	1,080	1,085
Treasury stock: 150 shares as of September 30, 2017 and December 31, 2016	(3,263)	(3,263)
Additional paid-in capital	1,336,358	1,282,077
Accumulated other comprehensive (loss) income	(3)	1
Accumulated deficit	(1,557,133)	(1,632,891)
Total stockholders' deficit	(222,961)	(352,991)
Total liabilities and stockholders' deficit	$ 390,972	$ 378,996

[1] Condensed consolidated balance sheet as of December 31, 2016 has been derived from audited consolidated financial statements.