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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Operating activities: |  |  |
Net income | $ 29,308 | $ 20,453 | $ 23,307
Adjustments to reconcile net income to net cash provided by operating activities |  |  |
Bad debt (recovery) expense | (711) | 4,811 | 3,346
Depreciation and amortization expense | 30,285 | 24,595 | 21,813
Amortization of debt issuance costs | 294 | 285 | 298
Loss on extinguishment of debt |  | 350 |
Accretion of acquisition liabilities |  | 36 | 363
Deferred taxes | (7,866) | (5,137) | 1,997
Noncash stock-based compensation expense | 21,887 | 5,984 | 1,680
Interest expense (income) | 103 | (12) | (119)
Change in fair value of contingent consideration | 57 | (949) | (1,079)
Offering costs | 22,074 | 3,555 |
Other | 733 | 673 |
Changes in operating assets and liabilities, net of effects of business combinations |  |  |
Trade receivables | (22,004) | (30,443) | (32,741)
Prepaid expenses and other current assets | (7,046) | (8,792) | (1,637)
Other non-current assets | (521) | (221) | (409)
Trade payables | (49) | 2,482 | (538)
Accrued expenses | 13,946 | 8,960 | 6,162
Other current liabilities | 3,741 | (6,560) | 9,954
Other non-current liabilities | (1,482) | 1,146 | (2,964)
Net cash provided by operating activities | 82,749 | 21,216 | 29,433
Investing activities: |  |  |
Purchase of property, plant and equipment | (9,397) | (9,751) | (5,943)
Acquisition of businesses, net of cash acquired | (149,217) |  | (57,252)
Net cash used in investing activities | (158,614) | (9,751) | (63,195)
Financing activities: |  |  |
Proceeds from long-term debt |  | 89,650 | 20,000
Payments of long-term debt | (22,000) | (142,113) | (750)
Payment of contingent consideration related to Zentrick acquisition |  | (601) | (601)
Deferred payment related to acquisition of assets |  |  | (71)
Repurchase of vested options |  | (15,506) |
Proceeds from Series A preferred stock issuance, net of issuance costs |  | 346,150 |
Payments to shareholders for preferred stock Series A |  | (260,686) |
Proceeds from common stock issued upon exercise of stock options | 12,440 | 780 | 177
Proceeds from common stock issued under employee purchase plan | 404 | 424 |
Proceeds from issuance of common stock upon initial public offering | 269,390 |  |
Proceeds from issuance of common stock in connection to concurrent private placement | 30,000 |  |
Payments related to offering costs | (22,069) | (3,610) |
Payments related to debt issuance costs |  | (577) |
Capital lease payments | (1,918) | (1,443) | (1,521)
Shares repurchased for settlement of employee tax withholdings | (1,802) |  |
Net cash provided by financing activities | 264,395 | 10,385 | 15,045
Effect of exchange rate changes on cash and cash equivalents and restricted cash | (200) | 203 | 23
Net increase (decrease) in cash, cash equivalents, and restricted cash | 188,330 | 22,053 | (18,694)
Cash, cash equivalents, and restricted cash-Beginning of period | 33,395 | 11,342 | 30,036
Cash, cash equivalents, and restricted cash-End of period | 221,725 | 33,395 | 11,342
Supplemental cash flow information: |  |  |
Cash paid for taxes | 7,698 | 16,180 | 1,962
Cash paid for interest | 774 | 3,369 | 4,659
Non-cash investing and financing transactions: |  |  |
Common stock issued in connection with acquisition | 22,526 |  |
Exchange of common stock for preferred stock |  | 260,686 |
Deferred payment obligation issued as consideration |  |  | 2,097
Contingent consideration issued |  |  | 4,690
Treasury stock reissued upon the conversion of Series A preferred stock for common stock | 260,686 |  |
Acquisition of equipment under capital lease | 1,518 | 1,603 | 1,535
Capital assets financed by accounts payable | 36 |  |
Offering costs included in accounts payable and accrued expense | 5 | 75 |
Leiki Oy acquisition |  |  |
Financing activities: |  |  |
Deferred payment related to acquisition of assets |  | (2,033) | $ (2,189)
Zentrick NV acquisition |  |  |
Financing activities: |  |  |
Deferred payment related to acquisition of assets | $ (50) | $ (50) |

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