CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash flows from operating activities:
Net loss	$ (33,194)	$ (40,320)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	3,334	4,249
Stock-based compensation	6,278	5,058
Change in fair value of earn-out liabilities	306	631
Change in fair value of derivative warrant liabilities	483	878
Change in fair value of forward contract	0	1,144
Impairment of deferred offering costs	0	836
Accretion of available-for-sale securities	(1,776)	(1,571)
Amortization of debt issuance costs, commitment fees and accretion of debt end-of-term liabilities	547	682
Non-cash lease expense	784	764
Changes in operating assets and liabilities:
Accounts receivable	(203)	(1,394)
Prepaid expenses, other current assets and other assets	(1,021)	(889)
Deferred revenue	493	(128)
Accounts payable	(1,085)	(1,298)
Accrued expenses and operating lease liabilities	(1,602)	(2,260)
Net cash used in operating activities	(26,656)	(33,618)
Cash flows from investing activities:
Purchases of property and equipment	(7,538)	(5,735)
Purchases of available-for-sale securities	(75,995)	(57,619)
Maturities of available-for-sale securities	76,500	60,589
Net cash used in investing activities	(7,033)	(2,765)
Cash flows from financing activities:
Payments of principal of notes payable	(6,199)	(2,858)
Proceeds from sale of common stock from sales through Common Stock Purchase Agreement	12,838	2,348
Proceeds from sale of common stock from sales through At-The-Market (ATM) Offering	26,833	0
Payments of offering costs	(447)	(107)
Proceeds from issuance of common stock upon exercise of stock options and warrants	68	903
Net cash provided by financing activities	33,093	286
Effects of exchange rate changes on cash and cash equivalents	(112)	(79)
Net decrease in cash and cash equivalents	(708)	(36,176)
Cash and cash equivalents - beginning of period	21,392	57,888
Cash and cash equivalents - end of period	20,684	21,712
Supplemental disclosures of other cash flow information:
Cash paid for interest	1,504	2,330
Non-cash investing and financing activities:
Capitalization of deferred costs to equity upon share issuance	132	13
Purchases of property and equipment recorded in accounts payable	739	307
Purchases of property and equipment recorded in accrued expenses	849	33
Purchases of deferred offering costs in accounts payable	29	0
Unrealized (Loss) Gain on short term investments	$ (16)	$ 241