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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 | $ 23,872 | $ 351 | $ 4,963
Reconciliation of net income to net cash provided by operating activities |  |  |
Deferred income taxes | 2,798 | 9,616 | (2,083)
Earn-out liability | 94 |  | (1,103)
Depreciation and amortization of property and equipment | 8,593 | 7,208 | 6,598
Amortization of intangible assets | 4,093 | 4,574 | 4,738
Provision for doubtful accounts | 2,592 | 1,705 | 1,375
Stock-based compensation | 12,510 | 12,728 | 8,023
Other, net | (364) | (15) |
Changes in assets and liabilities, net of effects of acquisition |  |  |
Accounts receivable | (4,569) | (5,586) | (3,735)
Deferred costs | (5,564) | (7,813) | (4,085)
Other current and non-current assets | (3,333) | 393 | (1,911)
Accounts payable | 937 | 832 | (382)
Accrued compensation | 3,957 | 1,304 | 2,291
Accrued expenses | (135) | 1,192 | 990
Deferred revenue | 7,094 | 5,588 | 2,852
Deferred rent | 2,440 | (1,027) | 234
Net cash provided by operating activities | 55,015 | 31,050 | 18,765
Cash flows from investing activities |  |  |
Purchases of property and equipment | (13,750) | (7,271) | (8,008)
Purchases of investments | (81,666) | (47,878) | (23,135)
Maturities of investments | 82,224 | 33,029 | 15,018
Acquisition of business and intangible assets, net of cash acquired | (27,273) | (500) | (18,032)
Net cash used in investing activities | (40,465) | (22,620) | (34,157)
Cash flows from financing activities |  |  |
Repurchases of common stock | (19,864) | (5,815) |
Net proceeds from exercise of options to purchase common stock | 14,344 | 1,410 | 4,303
Excess tax benefit from exercise of options to purchase common stock |  |  | 4,070
Net proceeds from employee stock purchase plan | 1,745 | 1,933 | 1,732
Net cash (used in) provided by financing activities | (3,775) | (2,472) | 10,105
Effect of foreign currency exchange rate changes | (43) | 1,292 | (374)
Net increase (decrease) in cash and cash equivalents | 10,732 | 7,250 | (5,661)
Cash and cash equivalents at beginning of year | 123,127 | 115,877 | 121,538
Cash and cash equivalents at end of year | 133,859 | 123,127 | 115,877
Supplemental disclosure of cash flow information |  |  |
Cash paid for income taxes, net | 1,534 | 1,068 | 722
Non-cash financing activities: |  |  |
Net purchases of property and equipment on account | 405 | $ 1,335 |
Common stock issued for business acquisitions | $ 3,371 |  | $ 2,922

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- Definition Amount of cash outflow to acquire investments classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition Amount of cash inflow from sale, maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3151-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26853-111562 + Details
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- Definition Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109197908&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with the amount received from the stock plan during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130534-203044 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition The fair value of stock issued in noncash financing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 + Details
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