Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities
Net income (loss)	$ (17,920)	$ (32,173)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense	757	785
Noncash lease expense	1,304	1,377
Stock-based compensation expense	8,685	5,702
Net amortization of premiums and accretion discounts on investments	0	10
Loss on disposal of property and equipment	18	0
Amortization of deferred debt issuance costs	18	100
Impairment of in-process research and development	0	1,190
Remeasurement of contingent consideration liability	0	(980)
Changes in operating assets and liabilities:
Accounts receivable - related party	185	0
Prepaid expenses and other current assets	1,280	(1,240)
Other non-current assets	408	(116)
Accounts payable	(1,186)	764
Contract liabilities — related party	(4,805)	(833)
Operating lease liabilities	(902)	(1,098)
Accrued and other current and non-current liabilities	1,558	(1,412)
Net cash used in operating activities	(10,600)	(27,924)
Cash flows from investing activities
Proceeds from sales of marketable debt securities	0	7,500
Proceeds from maturities of marketable debt securities	0	2,750
Purchases of property and equipment	(5,481)	(2,790)
Net cash provided by (used in) investing activities	(5,481)	7,460
Cash flows from financing activities
Proceeds from issuance of common stock, net of issuance costs	0	143,754
Proceeds from Employee Stock Purchase Plan	203	0
Proceeds from exercise of stock options	277	1,255
Taxes withheld and paid related to net share settlement of equity awards	(1,106)	0
Deferred issuance costs	(345)	(149)
Net cash provided by (used in) financing activities	(971)	144,860
Net change in cash, cash equivalents and restricted cash	(17,052)	124,396
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	260,642	213,253
Reconciliation of cash, cash equivalents and restricted cash:
Cash and cash equivalents	260,642	208,726
Restricted cash	0	4,527
Cash, cash equivalents and restricted cash, at the end of period	260,642	213,253
Supplemental cash flow information
Cash received from tax refund	0	158
Supplemental disclosures of noncash investing and financing activities
Purchases of property and equipment included in accounts payable	4,469	1,363
Operating right-of-use assets obtained in exchange for operating lease liabilities	2,343	0
Adjustment to goodwill	$ 0	$ 413