Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:
Net (loss) income	$ (101,519)	$ 6,182
Adjustments to reconcile (loss) income to net cash (used in) provided by operating activities:
Depreciation and amortization	288	299
Amortization of investments	575	1,126
Stock-based compensation	14,724	16,404
Amortization of intangible asset	1,273	997
Changes in assets and liabilities:
Accounts receivable, net	19,711	(27,685)
Inventory	(80,094)	(83,591)
Prepaid and other current assets	(9,907)	2,521
Other long-term assets		(24)
Interest receivable	229	672
Deferred revenue	(701)	(1,164)
Accounts payable and other current liabilities	(8,657)	51,279
Other long-term liabilities	647	(773)
Net cash used in operating activities	(163,431)	(33,757)
CASH FLOWS FROM INVESTING ACTIVITIES:
Maturities of securities	186,411	253,084
Purchases of securities	(14,172)	(74,510)
Disposal of furniture, fixtures and equipment		4
Net cash provided by investing activities	172,239	178,578
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from the sale of common stock, net of transaction costs	383	1,028
Proceeds from exercise of stock options, net of transaction costs	49	2,134
Taxes paid related to stock-based awards	(693)	(7,929)
Net cash used in financing activities	(261)	(4,767)
NET INCREASE IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH	8,547	140,054
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD	223,372	190,879
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD	231,919	330,933
Cash received (paid) during the year for:
Income taxes	(2,112)	3,711
Supplemental disclosure of non-cash transactions:
Initial recognition of operating lease right-of-use asset	$ 1,052
Laxdale Milestone		$ 12,000