BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 94,683	$ 140,717
Receivables	25	446
Prepaid expenses and other current assets	20,969	11,358
Total current assets	115,677	152,521
Property and equipment, net	825	581
Deposits	128	128
Other non-current assets	492	494
Total assets	117,122	153,724
Current liabilities:
Accounts payable	1,814	2,008
Accrued expenses	7,364	8,906
Deferred rent - current portion	177	348
Deferred revenue - current portion	6,389	6,861
Total current liabilities	15,744	18,123
Deferred rent, net of current portion	163	313
Deferred revenue, net of current portion	43,125	47,917
Derivative liabilities	694
Total liabilities	59,726	66,353
Commitments and contingencies (Note 5)
Stockholders' equity (deficit):
Preferred stock, $0.001 par value; 30,000,000 shares authorized, 250,000 designated as Series 1; 29,750,000 undesignated, no shares issued and outstanding at September 30, 2016 and December 31, 2015, respectively
Common stock, $0.001 par value; 250,000,000 shares authorized; 131,732,423 and 131,718,579 shares issued and outstanding at September 30, 2016 and December 31, 2015, respectively	132	132
Additional paid-in capital - common stock	582,225	579,939
Accumulated deficit	(646,773)	(492,700)
Total stockholders' equity (deficit)	(64,416)	87,371
Total liabilities, preferred stock, and stockholders' equity (deficit)	117,122	$ 153,724
Series 1 Preferred Stock
Current liabilities:
Series 1 preferred stock, $1,200 stated value; 250,000 designated; 103,063 and 0 shares issued and outstanding at September 30, 2016 and December 31, 2015, respectively	121,812
Stockholders' equity (deficit):
Total stockholders' equity (deficit)	$ 121,812