Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net loss	$ (17,781)	$ (8,222)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and write-off of property and equipment	390	363
Amortization of acquired intangible assets	1,536	0
Amortization and write-off of other intangible assets	171	177
Amortization of lease right of use assets under operating leases	271	118
Amortization of net premiums (discounts) on marketable securities	26	(266)
Stock-based compensation	2,468	2,010
Impairment of lease right of use assets and leasehold improvements	574	0
Changes in operating assets and liabilities:
Trade accounts receivable	1,731	(612)
Other current assets	(17)	219
Other assets	(601)	(44)
Accounts payable and other accrued liabilities	219	501
Deferred revenue	(423)	(55)
Lease liability and other long-term liabilities	(420)	(177)
Net cash used in operating activities	(11,856)	(5,988)
Cash flows from investing activities:
Net cash paid for acquisition	(3,512)	0
Purchase of property and equipment	(414)	(317)
Capitalized patent costs	(119)	(159)
Proceeds from maturities of marketable securities	5,937	17,494
Purchases of marketable securities	0	(25,151)
Net cash provided by (used in) investing activities	1,892	(8,133)
Cash flows from financing activities:
Purchase of common stock	(583)	(870)
Repayment of loan	(15)	0
Net cash used in financing activities	(598)	(870)
Effect of exchange rate on cash	1	0
Net decrease in cash and cash equivalents	(10,561)	(14,991)
Cash and cash equivalents at beginning of period	13,789	19,696
Cash and cash equivalents at end of period	3,228	4,705
Supplemental disclosure of cash flow information:
Cash paid for income taxes, net	(3)	(17)
Supplemental schedule of non-cash activities:
Property and equipment and patent costs in accounts payable	29	(103)
Stock-based compensation capitalized to software and patent costs	36	36
Common stock issued for acquisition	31,519	0
Warrants issued for acquisition	1,601	0
Right of use assets obtained in exchange for lease obligations	$ 5,176	$ 0