Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating activities
Net loss	$ (3,979)	$ (9,484)
Adjustments to reconcile net loss to cash used in operating activities:
Stock-based compensation expense	8,671	3,252
Depreciation and amortization	755	703
Amortization of debt issuance costs, discounts and premiums	0	230
Noncash lease expense	369	0
Change in fair value of compound derivative liability	0	7
Change in fair value of warrant liabilities	(12,640)	0
Change in fair value of earn-out liability	(16,462)	0
Amortization of premium on available-for-sale securities, net	77	55
Provision for excess and obsolete inventory	142	31
Provision (recovery) for doubtful accounts	133	(4)
Paid-in-kind interest	0	165
Other	15	5
Changes in operating assets and liabilities:
Accounts receivable	(4,965)	2,559
Inventory	(1,902)	(680)
Deferred costs of services	462	364
Prepaid expenses and other current assets	(526)	(444)
Other long-term assets	(113)	0
Accounts payable	2,165	1,020
Deferred revenue	29,185	923
Accrued and other liabilities	(5,507)	(2,593)
Net cash used in operating activities	(4,120)	(3,891)
Investing activities
Purchase of property and equipment	(2,159)	(192)
Purchase of available-for-sale securities	(77,919)	(77,990)
Proceeds from sales and maturities of available-for-sale securities	85,650	2,500
Net cash provided by (used in) investing activities	5,572	(75,682)
Financing activities
Payment of deferred transaction costs	0	(206)
Proceeds from exercise of stock options	1,242	823
Net cash provided by financing activities	1,242	617
Effect of exchange rates on cash, cash equivalents and restricted cash	(10)	(5)
Net increase (decrease) in cash, cash equivalents and restricted cash	2,684	(78,961)
Cash, cash equivalents and restricted cash at beginning of period	440,268	165,194
Cash, cash equivalents and restricted cash at end of period	442,952	86,233
Supplemental cash flow information:
Cash paid for interest	0	763
Supplemental disclosure of non-cash investing and financing activities:
Purchase of property and equipment included in accounts payable	905	90
Operating lease assets obtained in exchange for lease obligations	4,134	0
Surrender of shares in cashless exercise	0	56
Issuance of Common Stock for services	50	112
Transaction costs included in accounts payable	0	1,365
Reconciliation of cash, cash equivalents and restricted cash
Cash and cash equivalents	438,052	85,453
Restricted cash included in other long-term assets	4,900	780
Total cash, cash equivalents and restricted cash at end of period	$ 442,952	$ 86,233