Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities
Net loss	$ (24,815)	$ (18,451)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	3,750	3,792
Amortization of intangible assets	791	780
Non-cash lease expense	14
Change in fair value of 2022 USD Financing Warrants	5,185
Changes in operating assets and liabilities:
Prepaid and other current assets	909	922
Other noncurrent assets	18
Accounts payable	209	(843)
Accrued expenses	703	994
Other liabilities, long-term	(95)	(60)
Net cash used in operating activities	(13,331)	(12,866)
Cash flows from financing activities
Proceeds from issuance of common shares, net of issuance costs	583
Proceeds from exercise of warrants		118
Proceeds from exercise of options		123
Withholding taxes paid on vested restricted stock units		(407)
Net cash provided by/(used in) financing activities	583	(166)
Effect of exchange rate changes on cash	15	(35)
Net decrease in cash and cash equivalents	(12,733)	(13,067)
Cash and cash equivalents, beginning of year	142,142	133,539
Cash and cash equivalents, end of year	$ 129,409	$ 120,472