Condensed Consolidated Balance Sheets (Unaudited) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 24,668,339	$ 37,643,404
Receivables	5,981,040	7,529,032
Prepaid expenses and other current assets	1,252,186	1,914,077
Total current assets	31,901,565	47,086,513
Equipment and furnishings, net	646,500	1,042,892
Goodwill	183,780	183,780
Other assets	34,334	34,334
Total assets	32,766,179	48,347,519
Current liabilities:
Accounts payable	2,900,758	4,122,017
Accrued expenses and other current liabilities	7,515,258	8,029,274
Deferred revenue		6,924,353
Warrant liabilities		527,025
Term loan, net		10,599,795
Total liabilities	10,416,016	30,202,464
Commitments and contingencies
Stockholders' equity:
Preferred Stock, value
Common stock, $0.001 par value, 41,666,667 shares authorized; 33,637,501 shares issued and outstanding at September 30, 2018; 28,037,501 shares issued and outstanding at December 31, 2017	33,637	28,037
Additional paid-in capital	476,843,206	468,969,445
Accumulated deficit	(454,526,680)	(450,852,427)
Total stockholders' equity	22,350,163	18,145,055
Total liabilities and stockholders' equity	32,766,179	48,347,519
Series A Junior Participating Preferred Stock [Member]
Stockholders' equity:
Preferred Stock, value
Preferred Stock [Member]
Stockholders' equity:
Preferred Stock, value