Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Operating activities
Net loss	$ (54,880)	$ (169,253)
Adjustments to reconcile net loss to net cash used in operating activities:
Loss on forward sale of Series B Preferred Stock	0	60,081
Loss on bridge loans	0	13,719
Stock-based compensation expense	9,648	13,199
Amortization of developed technology	8,400	8,728
Depreciation and amortization	2,874	2,680
Provision for excess and obsolete inventory	963	7,239
Impairment of InstruNor developed technology intangible	0	3,526
Amortization of debt discounts, premiums and issuance costs	597	628
Other non-cash items	(224)	165
Changes in assets and liabilities:
Accounts receivable, net	677	1,123
Inventories, net	(3,258)	(7,810)
Prepaid expenses and other assets	749	(83)
Accounts payable	(484)	(1,501)
Accrued compensation and related benefits	1,366	5,561
Deferred revenue	218	(2,408)
Other liabilities	4,128	(5,783)
Net cash used in operating activities	(29,226)	(70,189)
Investing activities
Purchases of short-term investments	(55,857)	(137,302)
Proceeds from sales and maturities of investments	91,964	12,000
Purchases of property and equipment	(2,753)	(3,070)
Net cash provided by (used in) investing activities	33,354	(128,372)
Financing activities
Proceeds from bridge loans	0	25,000
Proceeds from issuance of Series B Preferred Stock	0	225,000
Repayment of term loan and advances under revolving credit facility	(833)	(6,838)
Payment of debt and equity issuance costs	0	(12,547)
Proceeds from exercise of stock options	80	97
Repurchase of common stock	(5,240)	0
Proceeds from ESPP stock issuance	326	497
Payments for taxes related to net share settlement of equity awards and other	(139)	(181)
Net cash provided by (used in) financing activities	(5,806)	231,028
Effect of foreign exchange rate fluctuations on cash and cash equivalents	(196)	(719)
Net increase (decrease) in cash, cash equivalents and restricted cash	(1,874)	31,748
Cash, cash equivalents and restricted cash at beginning of period	82,324	29,467
Cash, cash equivalents and restricted cash at end of period	80,450	61,215
Supplemental disclosures of cash flow information
Cash paid for interest	2,171	1,847
Cash paid for income taxes, net of refunds	629	248
Non-cash right-of-use assets and lease liabilities	226	503
Asset retirement obligations	$ 739	$ 703