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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Cash flows from operating activities    
Net loss $ (44,150) $ (90,142)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation and amortization 28,184 22,947
Stock-based compensation 54,083 78,209
Non-cash charitable contribution 3,191 3,270
Asset Impairment Charges 1,407 1,509
Amortization of cloud-based software implementation costs 1,679 96
Change in operating assets and liabilities:    
Accounts receivable, net 714 (126)
Inventory 5,231 (13,522)
Prepaid expenses and other assets 410 (4,546)
Accounts payable 2,756 (9,209)
Accrued expenses (1,207) (4,319)
Deferred revenue (8,005) (5,796)
Other current liabilities (116) (6)
Right-of-use lease assets and current and non-current lease liabilities 3,458 6,346
Other liabilities (309) 1,820
Net cash provided by (used in) operating activities 47,326 (13,469)
Cash flows from investing activities    
Purchases of property and equipment (40,098) (45,966)
Investment in optical equipment company (1,000) 0
Net cash used in investing activities (41,098) (45,966)
Cash flows from financing activities    
Proceeds from stock option exercises 1,017 295
Proceeds from shares issued in connection with employee stock purchase plan 1,124 1,754
Proceeds from repayment of related party loans 0 45
Net cash provided by financing activities 2,141 2,094
Effect of exchange rates on cash (989) (1,190)
Net change in cash and cash equivalents 7,380 (58,531)
Cash and cash equivalents, beginning of period 208,585 256,416
Cash and cash equivalents, end of period 215,965 197,885
Supplemental disclosures    
Cash paid for income taxes 400 471
Cash paid for interest 155 89
Payments for Leasing Costs 27,124 23,262
Non-cash investing and financing activities:    
Purchases of property and equipment included in accounts payable and accrued expenses $ 5,941 $ 4,819