STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities:
Net loss	$ (28,571)	$ (66,957)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	2,065	1,892
Amortization of financing costs	634	148
Stock-based compensation	2,651	9,857
Decrease (increase) in the carrying amount of right-of-use assets	2,306	(529)
Gain on lease modification	(133)	0
(Increase) decrease in:
Receivables	(1,800)	3,155
Prepaid expenses and other current assets	817	7,646
Other non-current assets	131	508
Increase (decrease) in:
Accounts payable	616	503
Accrued expenses	1,525	(3,169)
Lease liabilities	(2,371)	604
Other non-current liabilities	28	0
Net cash used in operating activities	(22,102)	(46,342)
Cash flows from investing activities:
Purchases of property and equipment	(100)	(2,964)
Net cash used in investing activities	(100)	(2,964)
Cash flows from financing activities:
Proceeds from long-term debt borrowing	0	25,000
Debt issuance costs	0	(75)
Proceeds from the exercise of stock options	21	1,037
Repurchase of common stock	(45)	0
Repayment of long-term debt	(2,083)	0
Net cash provided by (used in) financing activities	(2,107)	25,962
Net decrease in cash, cash equivalents and restricted cash	(24,309)	(23,344)
Cash, cash equivalents and restricted cash, beginning of period	76,054	115,069
Cash, cash equivalents and restricted cash, end of period	51,745	91,725
Supplementary disclosure of cash flow information:
Cash paid for interest	1,603	136
Amounts included in accrued expenses and accounts payable related to property and equipment	$ 74	$ 348