Condensed 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	$ (16,156)	$ (7,912)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation expense	1,195	469
Stock-based compensation	984	344
Changes in current assets and liabilities:
Prepaid expenses and other assets	(662)	(718)
Prepaid rent	(1,444)	0
Right-of-use assets and lease liabilities, net	(31)	56
Accounts payable	824	162
Accrued expense and other liabilities	(2,796)	(1,053)
Deferred revenue	(2,038)	(1,305)
Net cash used in operating activities	(20,124)	(9,957)
Cash flows from investing activities:
Purchases of property and equipment	(531)	(2,959)
Net cash used in investing activities	(531)	(2,959)
Cash flows from financing activities:
Proceeds from issuance of convertible preferred stock, net of issuance costs	0	99,730
Proceeds from exercise of stock options	88	108
Payment of deferred offering costs	0	(212)
Net cash provided by financing activities	88	99,626
Net increase (decrease) in cash, cash equivalents and restricted cash	(20,567)	86,710
Cash, cash equivalents, and restricted cash - beginning of period	166,436	35,386
Cash, cash equivalents, and restricted cash - end of period	145,869	122,096
Summary of cash, cash equivalents and restricted cash reported within the consolidated balance sheets:
Cash and cash equivalents	140,838	121,501
Restricted cash	5,031	595
Total cash, cash equivalents, and restricted cash	145,869	122,096
Supplemental cash flow information:
Purchase of property and equipment in accounts payable and accrued liabilities	416	1,837
Deferred offering costs included in accrued expenses	$ 0	$ 911