Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities:
Net loss	$ (33,194)	$ (32,126)
Adjustments to reconcile net loss to net cash used in operating activities:
Impairment of acquired contract intangible asset	0	3,724
Share-based compensation expense	5,794	4,016
Amortization of premiums and discounts on short-term investments, net	(2,062)	0
Non-cash interest expense	58	115
Non-cash lease expense	231	157
Depreciation and amortization expense	81	101
Changes in operating assets and liabilities:
Accounts receivable	(1,814)	(2,063)
Inventory	(1,362)	(727)
Prepaid expenses and other current assets	845	(524)
Other non-current assets	275	284
Operating lease liabilities	(250)	(90)
Accounts payable and accrued liabilities	(6,670)	(3,111)
Other liabilities	0	109
Net cash used in operating activities	(38,068)	(30,135)
Cash flows from investing activities:
Purchases of property and equipment	(2,058)	(264)
Purchase of short-term investments	(23,052)	0
Maturity of short-term investments	92,000	0
Net cash provided by (used in) investing activities	66,890	(264)
Cash flows from financing activities:
Issuance of common stock upon exercise of stock options	76	380
Proceeds from issuance of common stock under employee stock purchase plan	294	0
Issuance of common stock upon exercise of warrants	0	54
Deferred offering costs paid for financing	(49)	(223)
Net cash provided by financing activities	321	211
Net increase (decrease) in cash, cash equivalents and restricted cash	29,143	(30,188)
Cash, cash equivalents and restricted cash, beginning of year	39,083	148,989
Cash, cash equivalents and restricted cash, end of period	68,226	118,801
Supplemental disclosure of cash flow information:
Interest paid during the period	115	115
Taxes paid during the period	0	9
Supplemental disclosure of non-cash activities:
Deferred transaction costs included in accounts payable and accrued liabilities	0	75
Accrued property and equipment	519	51
Operating lease liability arising from obtaining right-of-use asset	$ 0	$ 1,210