Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities:
Net loss	$ (36,876)	$ (59,566)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization expense	949	816
Gain on disposal of fixed assets	(48)
Stockbased compensation expense	4,691	5,195
Noncash lease expense	3,023	3,562
Noncash interest expense	210	202
Amortization of premium on marketable securities	17
Changes in operating assets and liabilities:
Accounts receivable	36	150
Prepaid expenses and other current assets	698	(1,802)
Accounts payable	(733)	1,560
Accrued expenses and other current liabilities	(2,932)	(138)
Other liabilities	176
Lease liabilities	(3,172)	(3,538)
Deferred revenue	(10,296)	(7,467)
Net cash used in operating activities	(44,257)	(61,026)
Cash flows from investing activities:
Purchases of marketable securities	(42,524)
Proceeds from maturities of marketable securities	12,750
Purchase of property and equipment	(512)	(1,532)
Proceed from the sale of fixed assets	177
Net cash used in investing activities	(30,109)	(1,532)
Cash flows from financing activities:
Payments of deferred offering costs		(622)
Proceeds from the exercise of common stock options and employee equity plans	61	1,519
Net cash provided by financing activities	61	897
Net decrease in cash, cash equivalents and restricted cash	(74,305)	(61,661)
Cash, cash equivalents and restricted cash at beginning of period	108,511	203,422
Cash, cash equivalents and restricted cash at end of period	34,206	141,761
Supplemental disclosure of cash flow information:
Cash paid for interest	1,422	1,274
Supplemental disclosures of noncash investing and financing activities:
Right-of-use assets obtained in exchange for lease liabilities	68	1,399
Deferred offering costs included in accounts payable		622
Sale of property and equipment in prepaid expenses and other current assets	$ 53
Purchases of property and equipment included in accounts payable and accrued expenses		$ 238