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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2023 | Jun. 30, 2022
Cash flows from operating activities: |  |
Net Income (Loss) | $ 35,123 | $ 96,825
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 31,473 | 23,933
Amortization of debt issuance costs | 914 | 905
Stock-based compensation | 12,737 | 14,900
Deferred income taxes, net | (2,053) | 738
Contingent consideration | 3,026 | (9,295)
Noncash interest income | (2,023) | 0
Operating lease right of use asset amortization | 6,487 | 2,482
Other | 849 | 276
Changes in operating assets and liabilities, excluding impact of acquisitions: |  |
Accounts receivable | (4,606) | (8,433)
Inventories | (2,508) | (58,106)
Prepaid expenses and other assets | (12,879) | 2,402
Other assets | (888) | (406)
Accounts payable | (3,871) | 6,322
Accrued expenses | (11,769) | (4,014)
Operating lease Liabilities | (4,544) | (87)
Long-term liabilities | 154 | 392
Total cash provided by operating activities | 45,622 | 68,834
Cash flows from investing activities: |  |
Acquisitions, net of cash acquired | (28,099) | 0
Proceeds from maturity of marketable securities held to maturity | 102,323 | 0
Additions to capitalized software costs | (2,075) | (1,875)
Purchases of property, plant and equipment | (16,749) | (52,576)
Other investing activities | 0 | 17
Total cash provided by (used in) investing activities | 55,400 | (54,434)
Cash flows from financing activities: |  |
Proceeds from exercise of stock options | 62 | 463
Payment of tax withholding obligation on vesting of restricted stock | (11,140) | (14,759)
Repayment of Convertible Senior Notes | (9) | (18)
Payment of earnout consideration | (7,298) | 0
Proceeds from issuance of common stock, net | (3) | 0
Total cash used in financing activities | (18,388) | (14,314)
Effect of exchange rate changes on cash and cash equivalents | (2,436) | (7,388)
Net increase (decrease) in cash and cash equivalents | 80,198 | (7,302)
Cash, cash equivalents and restricted cash, beginning of period | 523,458 | 603,814
Cash and cash equivalents, end of period | 603,656 | 596,512
Supplemental disclosure of non-cash investing and financing activities: |  |
Assets acquired under operating leases | 831 | 21,739
FlexBiosys, Inc. |  |
Supplemental disclosure of non-cash investing and financing activities: |  |
Fair value of common stock issued for acquisition | 5,243 | 0
Avitide, Inc. |  |
Supplemental disclosure of non-cash investing and financing activities: |  |
Fair value of contingent consideration earnouts related to acquisition | $ 7,229 | $ 0

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