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v3.21.2

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Operating activities: |  |
Consolidated net income | $ 47,730 | $ 6,727
Adjustments to reconcile consolidated net income to net cash provided by (used for) operating activities: |  |
Depreciation and amortization | 8,564 | 8,175
Stock-based compensation expense | 5,005 | 4,286
Decrease in long-term deferred revenue | (240) | (241)
Decrease in contingent consideration obligations | (74) |
Gain on disposal of equipment |  | (9)
Decrease in other assets | 56 | 135
(Decrease) increase in long-term income taxes payable | (79) | 8
Deferred income taxes | 5 | 16
Credit gain on available-for-sale securities | (3) | (3)
Provision for doubtful accounts |  | 23
Change in current assets and liabilities, net | (20,737) | (3,742)
Net cash provided by operating activities | 40,227 | 15,375
Investing activities: |  |
Purchases of short-term investments | (50,706) |
Sales or maturities of short-term investments | 50,000 |
Additions to property, plant and equipment | (30,942) | (16,837)
Proceeds from sale of equipment |  | 9
Net cash used for investing activities | (31,648) | (16,828)
Financing activities: |  |
Proceeds from employee stock plans | 8,621 | 10,836
Payment of contingent consideration obligations | (153) | (186)
Proceeds from public offering of Common Stock |  | 109,681
Net cash provided by financing activities | 8,468 | 120,331
Effect of foreign exchange rates on cash | (126) | 59
Net increase in cash and cash equivalents | 16,921 | 118,937
Cash and cash equivalents at beginning of period | 161,742 | 84,668
Cash and cash equivalents at end of period | $ 178,663 | $ 203,605

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