Condensed Balance Sheets - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 15,765,269	$ 58,083,409
Marketable securities	72,433,068	18,931,715
Other receivables	7,000,000	2,500,000
Prepaid and other current assets	1,017,603	937,436
Total current assets	96,215,940	80,452,560
Property and equipment, net	228,405	261,446
Other assets	2,538,211	1,609,834
Total assets	98,982,556	82,323,840
Current liabilities:
Accounts payable and accrued expenses	8,710,745	5,311,093
Accrued compensation	1,366,568	2,351,703
Current portion of deferred revenue	24,630,685	30,897,192
Note payable	0	1,000,000
Total current liabilities	34,707,998	39,559,988
Deferred revenue, less current portion	17,063,762	20,803,762
Convertible note payable	12,779,452	0
Deferred rent	151,358	171,544
Stockholders’ equity:
Preferred stock, $0.0001 par value; 10,000,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $0.0001 par value; 200,000,000 shares authorized; 29,994,275 shares issued and outstanding at June 30, 2017; 26,118,722 shares issued and outstanding at December 31, 2016	3,000	2,612
Additional paid-in capital	193,949,708	172,424,531
Accumulated other comprehensive loss	(22,638)	(6,145)
Accumulated deficit	(159,650,084)	(150,632,452)
Total stockholders’ equity	34,279,986	21,788,546
Total liabilities and stockholders’ equity	$ 98,982,556	$ 82,323,840