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v3.21.2

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Operating activities: |  |
Consolidated net income | $ 34,478 | $ 941
Adjustments to reconcile consolidated net income to net cash provided by (used for) operating activities: |  |
Depreciation and amortization | 5,618 | 5,439
Stock-based compensation expense, net | 3,138 | 2,646
Decrease in long-term deferred revenue | (160) | (160)
Loss (gain) on disposal of equipment | 106 | (6)
Decrease in contingent consideration obligations | (74) |
Decrease in other assets | 37 | 95
Increase in long-term income taxes payable | 6 | 4
Deferred income taxes | 5 | 17
Credit gain on available-for-sale securities | (2) | (2)
Provision for doubtful accounts |  | 23
Change in current assets and liabilities, net | (13,037) | (5,233)
Net cash provided by operating activities | 30,115 | 3,764
Investing activities: |  |
Purchases of short-term investments | (50,706) |
Sales or maturities of short-term investments | 30,000 |
Additions to property, plant and equipment | (15,782) | (8,724)
Other | (106) | 6
Net cash used for investing activities | (36,594) | (8,718)
Financing activities: |  |
Proceeds from employee stock plans | 4,751 | 7,385
Payment of contingent consideration obligations | (107) | (144)
Proceeds from public offering of Common Stock |  | 109,732
Net cash provided by financing activities | 4,644 | 116,973
Effect of foreign exchange rates on cash | (144) | 17
Net (decrease) increase in cash and cash equivalents | (1,979) | 112,036
Cash and cash equivalents at beginning of period | 161,742 | 84,668
Cash and cash equivalents at end of period | $ 159,763 | $ 196,704

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