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Consolidated Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Operating activities:    
Net loss $ (7,004,290) $ (11,247,787)
Non-cash adjustments reconciling net loss to operating cash flows:    
Depreciation 2,315 288
Stock-based compensation 209,319 18,547
Non-cash lease expenses 10,549 0
Acquired in-process research and development 0 452,000
Impairment of goodwill 0 5,187,519
Changes in operating assets and liabilities:    
Other receivables (461,982) 259,562
Prepaid expenses (34,861) (35,838)
Other current assets 0 193,495
Other non-current assets 79,063 66,160
Accounts payable 172,413 9,739
Accrued expenses 710,459 288,846
Other liabilities (9,711) (75)
Net cash used in operating activities (6,326,726) (4,807,544)
Investing activities:    
Purchases of property and equipment 0 (8,200)
Acquisition of Pear Tree and Hydra asset 0 (452,000)
Net cash used in investing activities 0 (460,200)
Financing activities:    
Net proceeds from issuance of common stock and warrants 5,151,702 10,195,653
Net cash provided by financing activities 5,151,702 10,195,653
Effect of exchange rate changes on cash and cash equivalents (296) (41,231)
Net change in cash and cash equivalents (1,175,320) 4,886,678
Cash and cash equivalents, beginning of period 6,805,889 7,559,846
Cash and cash equivalents, end of period 5,630,569 12,446,524
Supplemental disclosure of non-cash operating and financing activities:    
Operating right-of-use assets obtained in exchange for new operating lease liabilities 231,698 0
Deemed dividend from trigger of down round provision $ 789,594 $ 0