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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: |  |  |
Consolidated net income | $ 56,629 | $ 17,922 | $ 14,109
Adjustments to reconcile consolidated net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 11,705 | 11,056 | 10,334
Stock-based compensation expense | 7,035 | 5,883 | 3,036
(Decrease) increase in long-term deferred revenue | (320) | (321) | 822
(Decrease) increase in long-term income taxes payable | (74) | 76 | 329
Deferred income taxes | 18 | (21) | 60
Provision (recovery) for doubtful accounts | 0 | 23 | (144)
Credit gain on available-for-sale securities | (4) | (4) | (4)
(Decrease) increase in contingent consideration obligations | (74) | 0 | 280
(Decrease) increase in other assets | (43) | 182 | (35)
Change in current assets and liabilities, net | (20,428) | (54) | (6,576)
Net cash provided by operating activities | 54,444 | 34,742 | 22,211
Investing activities: |  |  |
Purchases of short-term investments | (70,900) | (50,166) | 0
Additions to property, plant and equipment | (47,761) | (28,653) | (12,485)
Sales and maturities of short-term investments | 75,000 | 0 | 0
Net cash used for investing activities | (43,661) | (78,819) | (12,485)
Financing activities: |  |  |
Proceeds from employee stock plans | 10,243 | 11,585 | 4,742
Proceeds from public offering of Common Stock | 0 | 109,681 | 0
Payment of contingent consideration obligations | (153) | (224) | (237)
Noncontrolling interest dividend paid | 0 | 0 | (139)
Net cash provided by financing activities | 10,090 | 121,042 | 4,366
Effect of foreign exchange rates on cash | (197) | 109 | 19
Net increase in cash and cash equivalents | 20,676 | 77,074 | 14,111
Cash and cash equivalents at beginning of year | 161,742 | 84,668 | 70,557
Cash and cash equivalents at end of year | 182,418 | 161,742 | 84,668
Change in current assets and liabilities: |  |  |
Accounts receivable | (14,301) | (2,816) | 5,714
Inventories, net | (10,134) | (8,049) | (1,812)
Other current assets | 10 | 369 | (2,895)
Accounts payable and accrued liabilities | 2,503 | 8,668 | (7,339)
Accrued severance and other charges | 93 | 0 | (234)
Short-term lease payable | 4 | 34 | 12
Income taxes payable | (73) | 82 | (653)
Deferred revenue | 1,470 | 1,658 | 631
Change in current assets and liabilities, net | (20,428) | (54) | (6,576)
Supplemental disclosures: |  |  |
Cash paid during the year for income taxes, net of refunds | $ 645 | $ 79 | $ 2,194

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