CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities:
Net income (loss)	$ 178,902	$ (121,591)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization	1,800	1,687
Share-based compensation expense	18,748	19,042
Non-cash lease expense	2,253	1,895
Amortization of premiums and accretion of discounts on short-term investments	121	617
Loss on disposal of property and equipment	23
Deferred income taxes	(185,843)
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(8,726)	1,034
Accounts receivable, net	(7,174)	(3,224)
Inventory	(10,946)	(5,606)
Other long-term assets	2,919	(1,059)
Accounts payable	(399)	1,116
Accrued expenses and other current liabilities	82	295
Operating lease liabilities	(2,217)	(1,700)
Deferred revenue	26,290
Other long-term liabilities	1,550	80
Net cash provided (used) in operating activities	17,383	(107,414)
Cash flows from investing activities:
Proceeds from sale of property and equipment	81
Purchases of property and equipment	(137)	(164)
Purchases of short-term investments	(73,062)	(97,460)
Proceeds from the maturities of short-term investments	107,700	296,300
Intangible asset acquired		(20,000)
Net cash provided by investing activities	34,582	178,676
Cash flows from financing activities:
Proceeds from issuance of Class A common shares under incentive award plans and employee share purchase plans	2,127	4,673
Payments in connection with Common Stock tendered for employee tax obligations	(801)
Net cash provided by financing activities	1,326	4,673
Net increase in cash, cash equivalents and restricted cash	53,291	75,935
Cash, cash equivalents and restricted cash at beginning of period	122,470	114,248
Cash, cash equivalents and restricted cash at end of period	175,761	190,183
Supplemental information:
Cash paid for income taxes	4,608	859
Supplemental disclosure of non-cash investing and financing activities:
Right-of-use asset obtained in exchange for operating lease obligation	$ 2,876	$ 1,462