Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities
Net loss	$ (21,319)	$ (4,486)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense	326	313
Noncash lease expense	686
Stock-based compensation expense	3,043	299
Net amortization of premiums and accretion discounts on investments	9	(31)
Change in fair value of redeemable convertible preferred stock warrant liability		(70)
Amortization of deferred debt issuance costs	184
Impairment of in-process research and development	460
Reduction to revenue	3,981
Remeasurement of contingent consideration liability	(380)
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	36	(3,022)
Other non-current assets	(377)	(205)
Accounts payable	196	316
Contract liabilities — related party		(2,000)
Operating lease liabilities	(438)	(37)
Accrued and other current liabilities	(1,553)	571
Net cash used in operating activities	(15,146)	(8,352)
Cash flows from investing activities
Proceeds from sales of marketable debt securities	7,500
Purchases of marketable debt securities		(5,700)
Proceeds from maturities of marketable debt securities	1,000	10,440
Purchases of property and equipment	(658)	(295)
Net cash provided by investing activities	7,842	4,445
Cash flows from financing activities
Proceeds from issuance of common stock, net of issuance costs	143,754
Proceeds from exercise of stock options	976	42
Deferred debt issuance costs	157
Net cash provided by financing activities	144,887	42
Net change in cash, cash equivalents and restricted cash	137,583	(3,865)
Cash, cash equivalents and restricted cash, at the beginning of period	88,857	14,889
Cash, cash equivalents and restricted cash, at the end of period	226,440	11,024
Reconciliation of cash, cash equivalents and restricted cash:
Cash and cash equivalents	221,667	6,742
Restricted cash	4,773	4,282
Cash, cash equivalents and restricted cash, at the end of period	226,440	11,024
Supplemental cash flow information
Cash received from tax refund	158
Supplemental disclosures of noncash investing and financing activities
Purchases of property and equipment included in accounts payable	67	$ 71
Adjustment to goodwill	$ 56