Consolidated Balance Sheets - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 26,634,000	$ 52,306,000
Marketable securities	7,501,000	0
Accounts receivable	4,641,000	2,341,000
Restricted cash		2,997,000
Prepaid expenses and other current assets	1,600,000	1,484,000
Total current assets	40,376,000	59,128,000
Property and equipment, net	23,000	11,295,000
Other assets	143,000	239,000
Total assets	40,542,000	70,662,000
Current liabilities:
Accounts payable	1,425,000	3,245,000
Accrued expenses	4,106,000	9,301,000
Lease exit obligation		4,981,000
Loans payable, net of discount	2,053,000	11,722,000
Deferred revenue	814,000	537,000
Estimated settlement liability (Note 16)	4,000,000
Deferred rent		10,569,000
Total current liabilities	12,398,000	40,355,000
Loans payable, net of current portion and discount	7,418,000	8,930,000
Deferred revenue, net of current portion	2,881,000	231,000
Other liabilities	$ 618,000	$ 540,000
Commitments and contingencies (Note 8)
Stockholders’ equity:
Preferred stock, $.001 par value: 5,000 shares authorized; no shares issued and outstanding
Common stock, $.001 par value: 200,000 and 100,000 shares authorized at December 31, 2015 and 2014, respectively; 58,182 and 52,289 shares issued and outstanding at December 31, 2015 and 2014, respectively	$ 58,000	$ 52,000
Additional paid-in capital	512,201,000	500,582,000
Accumulated other comprehensive loss	(3,000)
Accumulated deficit	(495,029,000)	(480,028,000)
Total stockholders’ equity	17,227,000	20,606,000
Total liabilities and stockholders’ equity	$ 40,542,000	$ 70,662,000