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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Cash flows from operating activities |  |  |
Net loss | $ (37,730) | $ (48,398) | $ (47,479)
Adjustments to reconcile net loss to net cash provided by operating activities: |  |  |
Depreciation and amortization | 5,244 | 4,296 | 3,844
Stock-based compensation expense | 48,633 | 45,771 | 35,784
Recovery of doubtful accounts | (125) | (159) | (92)
Amortization of premiums and discounts on marketable securities, net | 3,024 | 668 | 13
Amortization of debt discount and issuance costs | 9,171 | 8,889 | 3,262
Gain on settlement of equity securities | (3,698) | 0 | 0
Deferred income tax | (1,973) | 0 | (65)
Changes in assets and liabilities: |  |  |
Accounts receivable | (7,683) | (8,028) | 5,166
Deferred costs | (19,207) | (15,953) | (10,268)
Operating lease right-of-use asset | 4,197 | 3,906 | 2,552
Other receivables | (391) | (680) | (1,250)
Prepaid expenses and other | (6,522) | (2,492) | (2,084)
Other assets | (1,222) | (215) | (1,860)
Accounts payable | 972 | (4,106) | 2,153
Deferred revenue | 47,419 | 37,479 | 32,039
Operating lease liability | (4,934) | (4,525) | (3,035)
Accrued expenses and other liabilities | 14,669 | 16,790 | 12,238
Net cash provided by operating activities | 49,844 | 33,243 | 30,918
Cash flows from investing activities |  |  |
Purchase of property and equipment | (3,534) | (1,873) | (3,104)
Purchase of marketable securities | (170,070) | (175,926) | (112,565)
Maturities of marketable securities | 143,159 | 62,922 | 26,840
Sale of marketable securities | 250 | 11,423 | 498
Acquisitions, net of cash acquired | (37,467) | 0 | 0
Purchase of intangible assets | (219) | (296) | (734)
Other investments | (750) | 0 | (1,000)
Net cash used in investing activities | (68,631) | (103,750) | (90,065)
Cash flows from financing activities |  |  |
Proceeds from option exercises | 16,600 | 19,189 | 24,152
Taxes paid related to net share settlements of stock-based compensation awards | (27,144) | (13,657) | (390)
Proceeds from shares issued in connection with employee stock purchase plan | 8,861 | 7,227 | 4,922
Proceeds from the issuance of convertible senior notes, net of issuance costs | 0 | 0 | 335,899
Principal payments on finance lease obligations | (1,705) | (1,641) | (1,565)
Net cash (used in) provided by financing activities | (3,388) | 11,118 | 363,018
Effect of foreign exchange rates on cash | (270) | 478 | 287
Net (decrease) increase in cash and cash equivalents | (22,445) | (58,911) | 304,158
Cash and cash equivalents at beginning of year | 322,831 | 381,742 | 77,584
Cash and cash equivalents at end of year | 300,386 | 322,831 | 381,742
Supplemental cash flow disclosure |  |  |
Cash paid for interest | 4,837 | 5,067 | 1,340
Cash paid for income taxes, net of refunds | (41) | 679 | 371
Supplemental disclosure of noncash investing and financing activities |  |  |
Allowance for tenant improvements | 0 | 149 | 270
Purchases of property and equipment, accrued but not paid | $ 350 | $ 263 | $ 144

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