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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash flows from operating activities:    
Net income $ 51,821 $ 31,698
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 15,558 5,558
Provision for doubtful accounts 147 14
Non-cash interest expense 1,979 7,156
Loss on partial settlement of convertibles notes 0 56,369
Deemed repayment of convertible notes attributable to accreted debt discount 0 (15,579)
Change in fair value of debt securities 1,116 (1,437)
Stock-based compensation 47,797 14,844
Deferred income taxes 3,165 (35,367)
Changes in operating assets and liabilities:    
Accounts receivable (24,224) (53,719)
Inventory (22,036) 6,888
Prepaid expenses and other assets (3,042) (5,040)
Accounts payable, accrued and other liabilities (1,805) 36,376
Warranty obligations 9,906 8,640
Deferred revenues 22,061 19,440
Net cash provided by operating activities 102,443 75,841
Cash flows from investing activities:    
Purchases of property and equipment (12,375) (9,940)
Investments in private companies 0 (25,000)
Business acquisitions, net of cash acquired (24,625) (55,239)
Maturities of marketable securities 76,735 0
Net cash provided by (used in) investing activities 39,735 (90,179)
Cash flows from financing activities:    
Issuance of convertible notes, net of issuance costs 0 1,189,388
Purchase of convertible note hedges 0 (286,235)
Sale of warrants 0 220,800
Principal payments and financing fees on debt 0 (1,078)
Partial repurchase of convertible notes 0 (289,233)
Proceeds from exercise of equity awards and employee stock purchase plan 404 214
Payment of withholding taxes related to net share settlement of equity awards (9,344) (9,185)
Net cash provided by (used in) financing activities (8,940) 824,671
Effect of exchange rate changes on cash and cash equivalents (704) (702)
Net increase in cash and cash equivalents 132,534 809,631
Cash and cash equivalents—Beginning of period 119,316 679,379
Cash and cash equivalents—End of period 251,850 1,489,010
Supplemental disclosures of non-cash investing and financing activities:    
Purchases of property and equipment included in accounts payable 4,352 7,301
Purchase Of Property and Equipment Through Tenant Improvement Allowance 748 0
Contingent consideration in connection with the acquisition 0 3,500
Convertible senior note issuance costs included in accounts payable and accrued expense $ 0 $ 991