Condensed Consolidated Statements of Cash Flows (Unaudited)	3 Months Ended
	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)
Cash flows from operating activities
Net (loss) income	$ (3,129,000)	$ 7,469,000
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Depreciation	1,063,000	609,000
Amortization of deferred financing costs	36,000	36,000
Amortization of right-of-use assets	604,000	177,000
Share based compensation expense	6,555,000	3,836,000
Allowance for credit losses	79,000	139,000
Changes in:
Accounts receivable	(2,695,000)	(3,437,000)
Inventories	(2,788,000)	(3,073,000)
Prepaid expenses, deposits and other assets	261,000	(2,908,000)
Accounts payable	(467,000)	2,473,000
Payroll-related accruals, accrued expenses and other liabilities	(6,247,000)	3,635,000
Lease prepayments for lessor's owned leasehold improvements	(2,097,000)	0
Operating lease liabilities	(275,000)	(190,000)
Net cash (used in) provided by operating activities	(9,100,000)	8,766,000
Cash flows from investing activities
Purchases of property and equipment	(2,745,000)	(1,265,000)
Purchases of marketable securities	(112,073,000)	(21,246,000)
Purchases of other investments	(5,693,000)	0
Maturities of marketable securities	47,000,000	0
Net cash used in investing activities	(73,511,000)	(22,511,000)
Cash flows from financing activities
Proceeds from issuance of common stock in public offering, net of issuance costs of $11.9 million	174,394,000	0
Proceeds from issuance of common stock under employee stock purchase plan	3,427,000	1,882,000
Proceeds from exercise of stock options	345,000	381,000
Payment of taxes related to vested restricted stock units	(1,624,000)	(49,000)
Net cash provided by financing activities	176,542,000	2,214,000
Effect of foreign exchange rate on cash and cash equivalents	(127,000)	(183,000)
Net increase (decrease) in cash	93,804,000	(11,714,000)
Cash and cash equivalents beginning of period	92,752,000	114,617,000
Cash and cash equivalents end of period	186,556,000	102,903,000
Supplemental disclosures of cash flow information:
Cash paid for income taxes	89,000	118,000
Cash paid for interest	$ 37,000	$ 37,000