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	$ (14,040)	$ (17,781)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and write-off of property and equipment	428	390
Amortization of acquired intangible assets	1,349	1,536
Amortization and write-off of other intangible assets	183	171
Amortization of lease right of use assets under operating leases	166	271
Amortization of net premiums on marketable securities	0	26
Stock-based compensation	2,876	2,468
Impairment of lease right of use assets and leasehold improvements	0	574
Changes in operating assets and liabilities:
Trade accounts receivable	631	1,731
Other current assets	1,766	(17)
Other assets	(191)	(601)
Accounts payable and other accrued liabilities	(910)	219
Deferred revenue	(925)	(423)
Lease liability and other long-term liabilities	(77)	(420)
Net cash used in operating activities	(8,744)	(11,856)
Cash flows from investing activities:
Net cash paid for acquisition	0	(3,512)
Purchase of property and equipment	(51)	(414)
Capitalized patent costs	(112)	(119)
Proceeds from maturities of marketable securities	10,247	5,937
Purchases of marketable securities	(1,975)	0
Net cash provided by investing activities	8,109	1,892
Cash flows from financing activities:
Purchase of common stock	(656)	(583)
Repayment of loans	(26)	(15)
Net cash used in financing activities	(682)	(598)
Effect of exchange rate on cash	20	1
Net decrease in cash and cash equivalents	(1,297)	(10,561)
Cash and cash equivalents at beginning of period	33,598	13,789
Cash and cash equivalents at end of period	32,301	3,228
Supplemental disclosure of cash flow information:
Cash paid for income taxes, net	2	3
Supplemental schedule of non-cash activities:
Property and equipment and patent costs in accounts payable	4	29
Stock-based compensation capitalized to software and patent costs	13	36
Common stock issued for acquisition	0	31,519
Warrants issued for acquisition	0	1,601
Right of use assets obtained in exchange for lease obligations	$ 0	$ 5,176