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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating Activities |  |  |
Net income | $ 42,146 | $ 65,170 | $ 13,199
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 7,817 | 5,029 | 3,795
Currency (gain) loss on foreign denominated transactions | (690) | (190) | 128
Deferred taxes | (3,734) | (39,040) | (1,117)
Provision for doubtful accounts | 1,091 | 1,680 | 1,117
Stock–based compensation expense | 34,301 | 20,794 | 5,028
Amortization of deferred contract costs | 8,416 | 3,689 |
Changes in operating assets and liabilities: |  |  |
Accounts receivable, net | (9,608) | (1,911) | (7,039)
Prepaid expenses, prepaid income taxes, and other assets | (378) | (11,753) | (2,287)
Deferred contracts costs | (15,979) | (12,987) |
Accounts payable | 4,268 | 9,345 | 6,244
Accrued expenses, accrued income taxes and other current liabilities | 2,151 | 2,695 | 5,191
Deferred revenue | 1,174 | 4,508 | 962
Deferred rent |  | 4,289 | 227
Lease obligations | (1,468) |  |
Other non–current liabilities | 609 | 405 | 243
Net cash provided by operating activities | 70,116 | 51,723 | 25,691
Investing Activities |  |  |
Purchases of property and equipment | (11,205) | (5,956) | (5,157)
Capitalization of website development costs | (3,021) | (1,522) | (2,215)
Cash paid for acquisition | (19,139) |  |
Investments in certificates of deposit | (177,808) | (212,800) | (50,000)
Maturities of certificates of deposit | 188,916 | 140,000 | 44,774
Net cash used in investing activities | (22,257) | (80,278) | (12,598)
Financing Activities |  |  |
Initial public offering proceeds |  |  | 47,690
Payment of initial public offering costs |  | (1,142) | (3,308)
Proceeds from exercise of stock options | 1,807 | 3,632 | 398
Financing cash flows from finance leases | (30) |  |
Payment of withholding taxes and option costs on net share settlement of restricted stock units and stock options | (16,470) | (25,885) |
Net cash (used in) provided by financing activities | (14,693) | (23,395) | 44,780
Impact of foreign currency on cash, cash equivalents, and restricted cash | (1) | (44) | 159
Net increase (decrease) in cash, cash equivalents, and restricted cash | 33,165 | (51,994) | 58,032
Cash, cash equivalents, and restricted cash at beginning of period | 37,558 | 89,552 | 31,520
Cash, cash equivalents, and restricted cash at end of period | 70,723 | 37,558 | 89,552
Supplemental disclosure of cash flow information: |  |  |
Cash paid for income taxes | 300 | 2,308 | 4,393
Unpaid purchases of property and equipment | 647 | 5,287 | 510
Unpaid initial public offering costs |  |  | 1,142
Capitalized stock-based compensation expense in website development and internal-use software costs | 1,381 | $ 490 | $ 176
Cash paid for operating lease liabilities | $ 10,906 |  |

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