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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Cash flows from operating activities: |  |
Net income | $ 99,181 | $ 40,228
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Inventory step-up amortization | 1,868 |
Depreciation and amortization | 27,430 | 19,581
Amortization of debt discount and issuance costs | 8,592 | 8,175
Stock-based compensation expense | 20,476 | 12,492
Deferred income taxes, net | 6,071 | 72
Other | 677 | 228
Changes in operating assets and liabilities, excluding impact of acquisitions: |  |
Accounts receivable | (51,927) | (11,358)
Unbilled receivables | 23 | (456)
Inventories | (61,598) | (22,767)
Prepaid expenses and other assets | 471 | (2,908)
Other assets | 751 | (260)
Accounts payable | 8,968 | 3,317
Accrued expenses | 10,051 | (2,712)
Long-term liabilities | (1,592) | 3,210
Total cash provided by operating activities | 69,396 | 47,754
Cash flows from investing activities: |  |
Acquisitions, net of cash acquired | (120,979) | (28,445)
Additions to capitalized software costs | (2,945) | (3,585)
Purchases of property, plant and equipment | (34,969) | (11,067)
Total cash used in investing activities | (158,893) | (43,097)
Cash flows from financing activities: |  |
Proceeds from exercise of stock options | 1,991 | 7,088
Payment of tax withholding obligation on vesting of restricted stock | (1,252) | (10)
Repayment of convertible senior notes | (9) |
Total cash provided by financing activities | 730 | 7,078
Effect of exchange rate changes on cash, cash equivalents and restricted cash | (7,427) | 4,160
Net (decrease) increase in cash, cash equivalents and restricted cash | (96,194) | 15,895
Cash, cash equivalents and restricted cash, beginning of period | 717,292 | 537,407
Cash and cash equivalents, end of period | 621,098 | 553,302
Supplemental disclosure of non-cash investing and financing activities: |  |
Assets acquired under operating leases | 32,518 | 1,456
Avitide, Inc. |  |
Supplemental disclosure of non-cash investing and financing activities: |  |
Fair value of common stock issued for acquisition | 77,576 |
Fair value of earnouts related to acquisition | $ 79,962 |

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