CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities:
Net loss	$ (28,659)	$ (28,209)
Adjustments to reconcile net loss to net cash used in operating activities
Stock-based compensation expense	3,695	4,816
Depreciation and amortization	2,781	1,774
Noncash operating lease cost	539	2,096
Amortization of premium (discount) on short-term investments	(390)	347
Restructuring and other charges	1,204
Other	144	43
Changes in operating assets and liabilities
Accounts receivable	(1,460)	4,949
Inventory and other deferred costs	262	(2,455)
Prepaid expenses and other assets	(254)	1,720
Accounts payable	(1,407)	1,132
Accrued and other current liabilities	426	3,398
Contract liabilities	4,999	(522)
Operating lease liabilities	2,375	(24)
Other long-term liabilities		(422)
Net cash used in operating activities	(15,745)	(11,357)
Cash flows from investing activities:
Purchases of available-for-sale debt securities	(21,529)	(59,702)
Proceeds from maturities of available-for-sale debt securities	39,100	65,175
Purchases of property and equipment	(3,778)	(8,634)
Net cash provided by (used in) investing activities	13,793	(3,161)
Cash flows from financing activities:
Proceeds from exercise of equity awards		515
Net cash provided by financing activities		515
Effect of exchange rates on cash, cash equivalents and restricted cash	(4)	4
Net change in cash, cash equivalents and restricted cash	(1,956)	(13,999)
Cash, cash equivalents, and restricted cash, beginning of period	90,918	107,375
Cash, cash equivalents and restricted cash, end of period	88,962	93,376
Reconciliation of cash, cash equivalents and restricted cash to the condensed consolidated balance sheets:
Cash and cash equivalents	87,172	91,586
Restricted cash, included in other long-term assets	1,790	1,790
Total cash, cash equivalents and restricted cash	$ 88,962	$ 93,376