Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 8,460	$ 13,450
Marketable securities, available-for-sale	28,990	23,258
Restricted cash	3,311	3,246
Receivables and other assets	6,249	4,544
Total current assets	47,010	44,498
Long-term investments	2,217	2,052
Property and equipment, net	1,375	1,873
Intangible assets, net	838	1,300
Other assets	388	191
Total assets	51,828	49,914
Current liabilities:
Accounts payable and accrued expenses	3,853	3,912
Deferred revenue	112	250
Total current liabilities	3,965	4,162
Long-term liabilities:
Deferred rent	0	359
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.01 par value, 5,000 shares authorized, none issued and outstanding	0	0
Common stock, $0.01 par value, 160,000 shares authorized, 11,049 and 9,154 shares issued and outstanding at September 30, 2016, and December 31, 2015, respectively	110	92
Additional paid-in capital	458,698	450,166
Accumulated deficit	(411,106)	(404,905)
Accumulated other comprehensive income	161	40
Total stockholders' equity	47,863	45,393
Total liabilities and stockholders' equity	$ 51,828	$ 49,914