Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities:
Net loss	$ (28,205)	$ (39,410)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization expense	633	510
Gain on disposal of fixed assets	(20)
Stockbased compensation expense	3,349	3,690
Noncash lease expense	2,114	2,367
Noncash interest expense	140	134
Amortization of premium on marketable securities	45
Changes in operating assets and liabilities:
Accounts receivable	36	(1)
Prepaid expenses and other current assets	(873)	(1,882)
Accounts payable	(1,095)	3,046
Accrued expenses and other current liabilities	(2,374)	898
Other liabilities	281
Lease liabilities	(2,256)	(2,464)
Deferred revenue	(6,044)	(5,548)
Net cash used in operating activities	(34,269)	(38,660)
Cash flows from investing activities:
Purchases of marketable securities	(41,040)
Purchase of property and equipment	(506)	(997)
Proceed from the sale of fixed assets	169
Proceeds from maturities of marketable securities	3,000
Net cash used in investing activities	(38,377)	(997)
Cash flows from financing activities:
Payments of deferred offering costs		(622)
Proceeds from employee equity plans	48	631
Net cash provided by financing activities	48	9
Net decrease in cash, cash equivalents and restricted cash	(72,598)	(39,648)
Cash, cash equivalents and restricted cash at beginning of period	108,511	203,422
Cash, cash equivalents and restricted cash at end of period	35,913	163,774
Supplemental disclosure of cash flow information:
Cash paid for interest	888	845
Supplemental disclosures of noncash investing and financing activities:
Right-of-use assets obtained in exchange for lease liabilities	68	564
Purchases of property and equipment included in accounts payable and accrued expenses	$ 5	$ 187