Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 18,056	$ 26,634
Marketable securities	5,749	7,501
Restricted cash	4,000
Accounts receivable	1,736	4,641
Prepaid expenses and other current assets	1,123	1,600
Total current assets	30,664	40,376
Property and equipment, net	18	23
Other assets	124	143
Total assets	30,806	40,542
Current liabilities:
Accounts payable	340	1,425
Accrued expenses	2,843	4,106
Loans payable, net of discount	3,019	2,053
Deferred revenue	660	814
Settlement liability (Note 11)	4,000	4,000
Total current liabilities	10,862	12,398
Loans payable, net of current portion and discount	6,537	7,418
Deferred revenue	2,832	2,881
Other liabilities	$ 660	$ 618
Stockholders’ equity:
Preferred stock, $.001 par value: 5,000 shares authorized; no shares issued and outstanding
Common stock, $.001 par value: 200,000 shares authorized; 58,182 and 58,182 shares issued and outstanding at March 31, 2016 and December 31, 2015, respectively	$ 58	$ 58
Additional paid-in capital	512,594	512,201
Accumulated other comprehensive income (loss)	2	(3)
Accumulated deficit	(502,739)	(495,029)
Total stockholders’ equity	9,915	17,227
Total liabilities and stockholders’ equity	$ 30,806	$ 40,542