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Consolidated Statements of Cash Flows - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2017
Operating activities:      
Net loss $ (3,051,840) $ (7,665,617)  
Non-cash adjustments reconciling net loss to operating cash flows:      
Depreciation 1,150 0  
Stock-based compensation 97,968 9,124  
Non-cash lease expenses 10,130    
Impairment of goodwill 0 5,187,519 $ 7,500,000
Changes in operating assets and liabilities:      
Other receivables (135,676) 255,318  
Prepaid expenses (201,129) 20,694  
Other current assets 0 193,495  
Other non-current assets and deferred charges 55,233 37,131  
Accounts payable (134,087) (40,340)  
Accrued expenses 59,478 (118,707)  
Other liabilities (9,711) 2,496  
Net cash used in operating activities (3,308,484) (2,118,887)  
Financing activities:      
Net proceeds from issuance of common stock and warrants 0 10,197,813  
Net cash provided by financing activities 0 10,197,813  
Effect of exchange rate changes on cash and cash equivalents 7,621 (13,746)  
Net change in cash and cash equivalents (3,300,863) 8,065,180  
Cash and cash equivalents, beginning of period 6,805,889 7,559,846  
Cash and cash equivalents, end of period 3,505,026 $ 15,625,026 $ 7,559,846
Supplemental disclosure of non-cash operating activities:      
Operating right-of-use assets obtained in exchange for new operating lease liabilities $ 231,698