Consolidated Balance Sheets - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 21,373,273	$ 37,497,691
Receivables	148,527	7,504,756
Prepaid expenses and other current assets	913,162	1,914,077
Current assets held for sale	81,182	169,989
Total current assets	22,516,144	47,086,513
Equipment and furnishings, net	44,326	71,466
Goodwill		183,780
Other assets	40,642	22,933
Non-current assets held for sale	324,853	982,827
Total assets	22,925,965	48,347,519
Current liabilities:
Accounts payable	1,234,762	4,065,998
Accrued expenses and other current liabilities	726,191	7,881,766
Deferred revenue		6,924,353
Term loan, net - current		10,599,795
Warrant liabilities		527,025
Current liabilities for sale	602,713	203,527
Total current liabilities	2,563,666	30,202,464
Commitment and contingencies
Stockholders' equity:
Common stock, $0.001 par value, 41,666,667 shares authorized; 33,637,501 and 28,037,501 shares issued and outstanding at December 31, 2018 and 2017, respectively	33,637	28,037
Additional paid-in capital	477,192,747	468,969,445
Accumulated deficit	(456,864,085)	(450,852,427)
Total stockholders' equity	20,362,299	18,145,055
Total liabilities and stockholders' equity	22,925,965	48,347,519
Series A Junior Participating Preferred Stock [Member]
Stockholders' equity:
Preferred Stock, value
Series B Convertible Preferred Stock [Member]
Stockholders' equity:
Preferred Stock, value