Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net loss from continuing operations	$ (1,666,532)	$ (3,275,704)
Adjustments to reconcile net loss from continuing operations to net cash used in operating activities:
Depreciation and amortization	5,444	8,001
Loss on retirement of fixed assets	5,433
Fair value adjustment on warrant liabilities		(453,412)
Amortization of loan cost and discount		448,125
Stock-based compensation expense	213,174	450,339
Changes in assets and liabilities:
Receivable	(9,753)	1,203,259
Prepaid expenses and other current assets	67,212	1,387,495
Other assets	25,463
Accounts payable	74,048	(813,391)
Accrued expenses and other current liabilities	215,834	164,712
Net cash used in operating activities from continuing operations	(1,069,677)	(880,576)
Net cash used in operating activities from discontinued operations	(523,642)	(669,748)
Net cash used in operating activities	(1,593,319)	(1,550,324)
Cash flows from investing activities:
Purchase of short-term investments	(11,036,102)
Sale of fixed assets held for sale	271,927
Net cash used in investing activities	(10,764,175)
Cash flows from financing activities:
Term loan principal repayment		(1,040,771)
Net cash used in financing activities		(1,040,771)
Net decrease in cash and cash equivalents	(12,357,494)	(2,591,095)
Cash and cash equivalents at beginning of year	21,373,273	37,497,691
Cash and cash equivalents at end of year	9,015,779	34,906,596
Supplemental disclosure of Cash Flow Information:
Cash paid during the year for interest		$ 252,552