BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 66,447	$ 81,053
Receivables	67	21
Prepaid expenses and other current assets	26,236	23,810
Total current assets	92,750	104,884
Property and equipment, net	1,124	843
Deposits	128	128
Other non-current assets	492	493
Total assets	94,494	106,348
Current liabilities:
Accounts payable	226	156
Accrued expenses	10,687	9,109
Deferred revenue - current portion	6,389	6,389
Deferred rent - current portion	162	155
Total current liabilities	17,464	15,809
Deferred revenue, net of current portion	39,931	41,528
Deferred rent, net of current portion	89	126
Derivative liabilities	2,471	862
Total liabilities	59,955	58,325
Commitments and contingencies (note 5)
Preferred stock, $0.001 par value, 30,000,000 shares authorized
Stockholders' deficit:
Common stock, $0.001 par value; 250,000,000 shares authorized; 132,381,670 and 132,376,670 shares issued and outstanding at March 31, 2017 and December 31, 2016, respectively	132	132
Additional paid-in capital - common stock	578,571	580,567
Accumulated deficit	(673,606)	(657,997)
Total stockholders' deficit	(94,903)	(77,298)
Total liabilities and stockholders' deficit	94,494	106,348
Series 1 Preferred Stock
Current liabilities:
Series 1 preferred stock, $1,200 stated value; 250,000 designated; 109,400 and 106,184 shares issued and outstanding at March 31, 2017 and December 31, 2016, respectively; liquidation value of $131.3 million and $127.4 million at March 31, 2017 and December 31, 2016, respectively	$ 129,442	$ 125,321