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	$ (39,321)	$ (46,915)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	414	535
Stock-based compensation expense	6,038	6,507
Revaluation of contingent consideration	(4,600)	21,239
Changes in operating assets and liabilities:
Accounts receivable	(14)	(167)
Prepaid expenses and other assets	1,309	(5,223)
Accounts payable	(4,283)	(1,290)
Accrued expenses	(178)	861
Net cash used in operating activities	(40,635)	(24,453)
Cash flows from investing activities:
Purchases of property and equipment	(350)	(52)
Purchases of marketable securities	(85,096)	(147,289)
Proceeds from sales and maturities of marketable securities	94,155	26,557
Net cash provided by (used in) investing activities	8,709	(120,784)
Cash flows from financing activities:
Payments of employee withholding taxes related to restricted stock unit award vesting	(23)	(3,038)
Proceeds from exercise of employee stock options and the issuance of stock	120	1,459
Net cash provided by financing activities	72,841	236,621
Net increase in cash and cash equivalents	40,915	91,384
Cash and cash equivalents at beginning of period	27,349	22,063
Cash and cash equivalents at end of period	68,264	113,447
Supplemental disclosure of non-cash investing and financing activities:
Additions to property and equipment included in accounts payable	72	37
Offering costs included in accounts payable		28
Public Offering
Cash flows from financing activities:
Proceeds from issuance of common stock, net of issuance costs		$ 238,200
At The Market Offering
Cash flows from financing activities:
Proceeds from issuance of common stock, net of issuance costs	$ 72,744