CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	[1]
Current assets:
Cash and cash equivalents	$ 127,634	$ 118,016
Short-term marketable securities	7,992	32,417
Related party receivables from collaborative arrangements	61,796	46,847
Prepaid expenses and other current assets	642	766
Total current assets	198,064	198,046
Property and equipment, net	289	368
Capitalized fees paid to a related party, net	173,633	180,545
Other assets	37	37
Total assets	372,023	378,996
Current liabilities:
Accounts payable	277	128
Accrued personnel-related expenses	1,203	2,361
Accrued interest payable	7,103	7,828
Other accrued liabilities	2,460	1,095
Non-recourse notes, due 2029, current	15,181	7,752
Deferred revenue, current	885	885
Total current liabilities	27,109	20,049
Convertible subordinated notes, due 2023, net of issuance costs	237,858	237,597
Non-recourse notes, due 2029, net of issuance costs	400,854	470,744
Other long-term liabilities	1,159	1,383
Deferred revenue	1,772	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, 109,510 and 108,585 shares issued as of June 30, 2017 and December 31, 2016, respectively	1,094	1,085
Treasury stock: 150 shares as of June 30, 2017 and December 31, 2016	(3,263)	(3,263)
Additional paid-in capital	1,286,340	1,282,077
Accumulated other comprehensive income	0	1
Accumulated deficit	(1,580,900)	(1,632,891)
Total stockholders' deficit	(296,729)	(352,991)
Total liabilities and stockholders' deficit	$ 372,023	$ 378,996

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