Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities
Net income (loss)	$ 4,618	$ (21,319)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense	352	326
Noncash lease expense	645	686
Stock-based compensation expense	4,350	3,043
Net amortization of premiums and accretion discounts on investments		9
Loss on disposal of property and equipment	18
Amortization of deferred debt issuance costs	18	184
Impairment of in-process research and development	0	460
Reduction to revenue	0	3,981
Remeasurement of contingent consideration liability	0	(380)
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	1,077	36
Accounts receivable - related party	185
Other non-current assets	117	(377)
Accounts payable	(612)	196
Contract liabilities — related party	(4,805)
Operating lease liabilities	(361)	(438)
Accrued and other current liabilities	(1,497)	(1,553)
Net cash used in operating activities	4,105	(15,146)
Cash flows from investing activities
Proceeds from sales of marketable debt securities		7,500
Proceeds from maturities of marketable debt securities		1,000
Purchases of property and equipment	(2,632)	(658)
Net cash provided by (used in) investing activities	(2,632)	7,842
Cash flows from financing activities
Taxes withheld and paid related to net share settlement of equity awards	(1,106)
Proceeds from issuance of common stock, net of issuance costs		143,754
Proceeds from exercise of stock options	94	976
Deferred issuance costs	(122)	(157)
Net cash provided by (used in) financing activities	(1,134)	144,887
Net change in cash, cash equivalents and restricted cash	339	137,583
Cash, cash equivalents and restricted cash, at the beginning of period	277,694	88,857
Cash, cash equivalents and restricted cash, at the end of period	278,033	226,440
Reconciliation of cash, cash equivalents and restricted cash:
Cash and cash equivalents	277,883	221,667
Restricted cash	150	4,773
Cash, cash equivalents and restricted cash, at the end of period	278,033	226,440
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	1,481	67
Adjustment to goodwill		$ 56