Condensed Consolidated Statements of Cash Flows - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net loss	$ (9,668,755)	$ (9,400,257)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	3,588	3,812
Stock‑based compensation	1,822,562	905,471
Amortization of right of use lease asset	72,416	63,962
Foreign currency loss (gain)	(521,983)	(2,247,891)
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	931,576	864,937
Accounts payable	(1,046,891)	829,836
Accrued expenses and other liabilities	(3,038,763)	1,656,216
Lease liability	(75,856)	(217,711)
Net cash used in operating activities	(11,522,106)	(7,541,625)
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
Net cash provided by financing activities		29,523
Decrease in cash and cash equivalents	(11,522,106)	(7,524,267)
Effect of exchange rate changes on cash	120,494	(51,245)
Cash and cash equivalents—beginning of year	89,017,686	130,088,869
Cash and cash equivalents—end of period	$ 77,616,074	$ 122,513,357