Condensed Consolidated Statements of Cash Flows - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net loss	$ (9,400,257)	$ (3,475,202)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	3,812	2,141
Stock‑based compensation	905,471	97,946
Amortization of right of use lease asset	63,962	25,782
Foreign currency gain	(2,247,891)	(935,916)
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	864,937	57,929
Accounts payable	829,836	202,292
Accrued expenses and other liabilities	1,656,216	(145,555)
Lease liability	(217,711)	(26,763)
Net cash used in operating activities	(7,541,625)	(4,197,346)
Cash flows from investing activities:
Purchases of property and equipment	(12,165)
Net cash used in investing activities	(12,165)
Cash flows from financing activities:
Proceeds from the exercise of stock options	29,523	23,118
Deferred offering costs		(188,826)
Proceeds from issuance of Series C convertible preferred, net		5,598,362
Net cash provided by financing activities	29,523	5,432,654
Increase (decrease) in cash and cash equivalents	(7,524,267)	1,235,308
Effect of exchange rate changes on cash	(51,245)	(1,228,692)
Cash and cash equivalents—beginning of year	130,088,869	65,675,931
Cash and cash equivalents—end of year	$ 122,513,357	65,682,547
Non‑cash activities:
Cumulative effect of change in accounting principle—ASC 842 adoption		$ 329,384