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v3.19.1

Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash flows from operating activities |  |  |
Net income | $ 45,885 | $ 126,959 | $ 11,001
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |
Depreciation and amortization | 5,772 | 5,002 | 4,258
Gain on sale of equipment |  |  | (248)
Deferred income taxes | 11,209 | (82,085) | 519
Stock-based compensation expense | 7,784 | 5,672 | 5,179
Provision for doubtful accounts |  |  | 106
Provision for excess and obsolete inventory | 2,205 | 8,135 | 1,051
Changes in operating assets & liabilities: |  |  |
Accounts receivable | (3,877) | (23,573) | (14,135)
Inventories | (10,512) | (10,567) | (6,572)
Prepaid expenses and other current assets | (1,436) | (3,866) | (1,056)
Accounts payable and other current liabilities | (703) | 25,000 | 810
Deferred revenue | 6,055 | 7,079 | 2,467
Income taxes | 196 | 14 | 102
Other assets and liabilities | (15,613) | (1,486) | (12,270)
Net cash provided by (used in) operating activities | 46,965 | 56,284 | (8,788)
Cash flows from investing activities |  |  |
Proceeds from sale of equipment |  |  | 270
Expenditures for property, plant and equipment and capitalized software | (4,715) | (7,285) | (2,506)
Net cash used in investing activities | (4,715) | (7,285) | (2,236)
Cash flows from financing activities |  |  |
Net settlement on restricted stock grants | (1,419) | (1,184) | (11)
Financing fees and other expenses |  |  | (146)
Proceeds from Employee Stock Purchase Plan | 871 | 739 | 277
Proceeds from exercise of stock options | 1,734 | 15,515 | 2,227
Net cash provided by financing activities | 1,186 | 15,070 | 2,347
Effect of exchange rate changes on cash and cash equivalents | 586 | (844) | 507
Net increase (decrease) in cash, cash equivalents and restricted cash | 44,022 | 63,225 | (8,170)
Cash, cash equivalents and restricted cash at beginning of period | 140,880 | 77,655 | 85,825
Cash, cash equivalents and restricted cash at end of period | 184,902 | 140,880 | 77,655
Supplemental disclosure of cash flow information |  |  |
Income taxes | 858 | 583 | 525
Interest | $ 5,470 | $ 5,315 | $ 4,815

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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration