Condensed Consolidated Statements of Cash Flows - USD ($)	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net loss	$ (25,768,184)	$ (8,737,650)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	7,866	4,739
Stock‑based compensation	2,161,931	284,909
Amortization of right of use lease asset	108,164	51,853
Foreign currency gain	(358,201)	(1,615,974)
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	1,480,655	19,721
Accounts payable	3,266,274	640,719
Accrued expenses and other liabilities	2,185,307	232,679
Lease liability	(263,750)	(53,815)
Net cash used in operating activities	(17,179,938)	(9,172,819)
Cash flows from investing activities:
Purchases of property and equipment	(10,144)	(6,189)
Net cash used in investing activities	(10,144)	(6,189)
Cash flows from financing activities:
Proceeds from the exercise of stock options	150,949	23,118
Deferred offering costs		(624,624)
Proceeds from issuance of Series C convertible preferred, net		5,598,362
Net cash provided by financing activities	150,949	4,996,856
Decrease in cash and cash equivalents	(17,039,133)	(4,182,152)
Effect of exchange rate changes on cash	(188,232)	(499,041)
Cash and cash equivalents—beginning of year	130,088,869	65,675,931
Cash and cash equivalents—end of year	$ 112,861,504	60,994,738
Non‑cash activities:
Cumulative effect of change in accounting principle—ASC 842 adoption		$ 329,384