CONDENSED BALANCE SHEETS (Unaudited) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 35,097,042	$ 37,643,404
Receivables	6,347,014	7,529,032
Prepaid expenses and other current assets	557,679	1,914,077
Total current assets	42,001,735	47,086,513
Equipment and furnishings, net	907,634	1,042,892
Goodwill	183,780	183,780
Other assets	34,334	34,334
Total assets	43,127,483	48,347,519
Current liabilities:
Accounts payable	3,471,183	4,122,017
Accrued expenses and other current liabilities	8,322,796	8,029,274
Deferred revenue	0	6,924,353
Warrant liabilities	73,613	527,025
Term loan, net	10,007,149	10,599,795
Total liabilities	21,874,741	30,202,464
Commitments and contingencies
Stockholders' equity:
Common stock, $0.001 par value, 41,666,667 shares authorized; 28,037,501 shares issued and outstanding at March 31, 2018 and December 31, 2017	28,037	28,037
Additional paid-in capital	469,450,756	468,969,445
Accumulated deficit	(448,226,051)	(450,852,427)
Total stockholders' equity	21,252,742	18,145,055
Total liabilities and stockholders' equity	43,127,483	48,347,519
Series A Junior Participating Preferred Stock [Member]
Stockholders' equity:
Preferred Stock	0	0
Series B Convertible Preferred Shares [Member]
Stockholders' equity:
Preferred Stock	$ 0	$ 0