Condensed Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities
Net loss	$ (57,646)	$ (45,687)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation expense	914	729
Stock-based compensation expense	6,934	4,858
Non-cash operating lease expense	684	441
Other	443	529
Changes in operating assets and liabilities:
Accounts receivable	(2,991)	7,449
Prepaid expenses and other current assets	1,907	(328)
Other non-current assets	0	0
Accounts payable	202	741
Accrued liabilities	5,404	(1,333)
Other long term liabilities	0	0
Operating lease liabilities	(745)	(467)
Net cash used in operating activities	(44,894)	(33,068)
Cash flows from investing activities
Purchase of short-term investments	(78,048)	(138,832)
Maturity of short-term investments	86,972	155,529
Purchase of property and equipment	(898)	(881)
Net cash provided by investing activities	8,026	15,816
Cash flows from financing activities
Proceeds from exercise of stock options	498	1,741
Payment of deferred offering costs	(75)	(179)
Payment of debt issuance costs	(150)	0
Proceeds from term loan	10,000	0
Net cash provided by financing activities	10,273	1,562
Net decrease in cash and cash equivalents	(26,595)	(15,690)
Cash and cash equivalents at beginning of period	51,665	50,882
Cash and cash equivalents at end of period	25,070	35,192
Supplemental disclosures of cash flow information:
Cash paid for interest	72	0
Supplemental disclosures of noncash investing and financing activities:
Purchase of property and equipment in accounts payable and accrued liabilities	0	82
Reclassification of restricted stock awards from liabilities to common stock upon vesting	1	5
Net unrealized (loss) gain on short-term investments	$ (1,058)	$ 2