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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2022 | Jun. 30, 2021
Cash flows from operating activities: |  |
Net loss | $ (5,297) | $ (12,081)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities: |  |
Depreciation and amortization | 2,773 | 3,345
Stock-based compensation expense | 9,425 | 6,111
Amortization of acquired intangible assets | 1,734 | 1,698
Amortization of costs capitalized to obtain revenue contracts | 755 | 327
Deferred taxes | 17 | 84
Other | 20 | 133
Changes in operating assets and liabilities: |  |
Accounts receivable | 3,910 | 3,989
Prepaid expenses and other current assets | (3,208) | 1,235
Operating lease right-of-use assets | 1,238 | 740
Other non-current assets | 1,002 | 362
Accounts payable | (3,633) | (1,723)
Accrued compensation and related benefits | 1,362 | (1,028)
Accrued and other liabilities | 2,147 | 116
Deferred revenues | (4,789) | (3,514)
Billings in excess of recognized revenues | 480 | 848
Operating lease liabilities | (1,316) | (837)
Net cash provided by (used in) operating activities | 6,620 | (195)
Cash flows from investing activities: |  |
Proceeds from maturities and sales of short-term investments | 112,500 | 109,000
Purchases of short-term investments | (35,920) | (45,992)
Purchases of property and equipment | (4,454) | (1,121)
Prepayment for the purchase of property and equipment | (133) |
Net cash provided by investing activities | 71,993 | 61,887
Cash flows from financing activities: |  |
Proceeds from exercise of stock options | 788 | 793
Proceeds from employee stock purchase plan | 1,502 | 921
Payments for taxes related to net share settlement of equity awards | (4,189) | (2,350)
Repurchases of common stock | (22,471) | (4,523)
Net cash used in financing activities | (24,370) | (5,159)
Effect of exchange rate changes on cash and cash equivalents | (584) | (128)
Net change in cash, cash equivalents, and restricted cash | 53,659 | 56,405
Cash, cash equivalents, and restricted cash at beginning of period | 27,684 | 33,815
Cash, cash equivalents, and restricted cash at end of period | 81,343 | 90,220
Reconciliation of cash, cash equivalents, and restricted cash to the balance sheets: |  |
Cash and cash equivalents | 81,343 | 87,201
Restricted cash |  | 3,019
Total cash, cash equivalents and restricted cash | 81,343 | 90,220
Supplemental disclosure of cash flow information: |  |
Cash paid during the period for taxes | 1,690 | 1,275
Cash paid for amounts included in the measurement of operating lease liabilities | 795 | 1,076
Supplemental disclosure of noncash information: |  |
Property and equipment received and accrued in accounts payable and accrued and other liabilities | 2,466 | 530
Advances for purchase of fixed assets transferred from prepaid assets to property and equipment | 333 | 963
Operating lease liabilities arising from obtaining right-of-use assets | $ 1,137 |
Release of restricted cash reducing goodwill due to the acquisition purchase price adjustment |  | $ 469

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