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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Cash flows from operating activities |  |  |
Net income (loss) | $ (6,333) | $ (5,829) | $ 20,950
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |  |
Depreciation and amortization | 21,628 | 18,581 | 13,834
Loss on rental assets and other fixed assets | 1,521 | 864 | 568
Gain on sale of former rental assets | (65) | (94) | (68)
Provision for sales revenue returns and doubtful accounts | 11,094 | 10,486 | 17,177
Provision for rental revenue adjustments |  | 2,579 | 2,233
Provision for inventory losses | 2,062 | 1,283 | 972
Stock-based compensation expense | 10,943 | 8,203 | 9,129
Deferred income taxes | 14,444 | (82) | 2,873
Change in fair value of earnout liability | (11,596) | 1,053 | 810
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (6,127) | (8,177) | (16,707)
Inventories | (10,775) | 7,591 | (10,336)
Income tax receivable | 705 | 928 | (321)
Prepaid expenses and other current assets | (8,104) | 31 | (2,693)
Operating lease right-of-use asset | (16,087) | (2,970) | (5,856)
Other noncurrent assets | 96 | 2,296 | (2,064)
Accounts payable and accrued expenses | (6,476) | (5,830) | 3,202
Accrued payroll | 10,231 | 870 | (5,188)
Warranty reserve | (668) | 1,823 | 3,041
Deferred revenue | 1,613 | (203) | 2,724
Income tax payable | (1,141) | 319 | 429
Operating lease liability | 16,668 | 3,291 | 6,716
Other noncurrent liabilities |  |  | (832)
Net cash provided by operating activities | 23,633 | 37,013 | 40,593
Cash flows from investing activities |  |  |
Purchases of marketable securities | (9,987) | (22,751) | (58,686)
Maturities of marketable securities | 19,256 | 14,545 | 91,350
Investment in intangible assets | (132) | (255) | (254)
Investment in property and equipment | (5,482) | (4,385) | (3,143)
Production and purchase of rental equipment | (18,453) | (12,957) | (3,117)
Proceeds from sale of former assets | 153 | 163 | 194
Payment for acquisition, net of cash acquired |  |  | (70,401)
Net cash used in investing activities | (14,645) | (25,640) | (44,057)
Cash flows from financing activities |  |  |
Proceeds from stock options exercised | 13,699 | 332 | 3,109
Proceeds from employee stock purchases | 1,948 | 2,084 | 2,748
Payment of employment taxes related to release of restricted stock | (647) | (350) | (928)
Net cash provided by financing activities | 15,000 | 2,066 | 4,929
Effect of exchange rates on cash | (426) | 486 | (62)
Net increase in cash and cash equivalents | 23,562 | 13,925 | 1,403
Cash and cash equivalents, beginning of period | 211,962 | 198,037 | 196,634
Cash and cash equivalents, end of period | 235,524 | 211,962 | 198,037
Supplemental disclosures of cash flow information |  |  |
Cash paid (received) during the period for income taxes, net of refunds received | 1,544 | (713) | 239
Supplemental disclosure of non-cash transactions |  |  |
Accrued value of earnout related to acquisition |  |  | 25,749
Property and equipment in account payable and accrued liabilities | $ 353 | $ 55 | $ 66

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