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Consolidated Statements of Cash Flows - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Cash flows from operating activities: |  |  |
Net income (loss) | $ (4,431,000) | $ 1,225,000 | $ 1,798,000
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |  |
Depreciation of property and equipment | 5,795,000 | 5,399,000 | 4,894,000
Amortization of intangible assets | 1,032,000 | 187,000 | 88,000
Impairment of property and equipment | 25,000 | 234,000 | 0
Stock-based compensation | 5,872,000 | 4,462,000 | 3,057,000
Loss on disposal of property and equipment |  | 3,000 |
Provision for accounts receivable |  | 74,000 |
Changes in operating assets and liabilities: |  |  |
Accounts receivable and contract asset | (3,213,000) | 1,953,000 | 1,383,000
Prepaid expenses and other assets | (673,000) | (321,000) | (192,000)
Accounts payable | 354,000 | (190,000) | (243,000)
Accrued expenses and other current liabilities | 2,918,000 | 575,000 | 108,000
Deferred revenue | 2,143,000 | (2,392,000) | 2,799,000
Net cash provided by operating activities | 9,822,000 | 11,209,000 | 13,692,000
Cash flows from investing activities: |  |  |
Purchase of property and equipment | (7,840,000) | (4,059,000) | (4,823,000)
Investment in intangible and other assets | (59,000) | (72,000) | (86,000)
Business acquisition, net of cash acquired | 15,000 | (14,627,000) |
Net cash used in investing activities | (7,884,000) | (18,758,000) | (4,909,000)
Cash flows from financing activities: |  |  |
Payment of contingent consideration liability | (403,000) | (347,000) |
Payment of line of credit costs |  | (12,000) |
Proceeds from issuance of common stock upon secondary offering |  |  | 11,247,000
Payments of secondary offering costs |  |  | (445,000)
Proceeds from exercise of stock options | 898,000 | 314,000 | 454,000
Repurchases of common stock | (3,601,000) | (1,615,000) | (6,718,000)
Proceeds from exercise of warrants | 8,000 |  | 71,000
Proceeds from employee stock purchase plan | 832,000 | 704,000 | 873,000
Net cash provided by (used in) financing activities | (2,266,000) | (956,000) | 5,482,000
Increase (decrease) in cash, cash equivalents and restricted cash | (328,000) | (8,505,000) | 14,265,000
Effect of exchange rate on cash and cash equivalents | (79,000) | (2,000) | 7,000
Cash, cash equivalents and restricted cash at beginning of year | 16,043,000 | 24,550,000 | 10,278,000
Cash, cash equivalents and restricted cash at end of year | 15,636,000 | 16,043,000 | 24,550,000
Supplemental cash flow disclosures: |  |  |
Cash paid for income taxes |  |  | 51,000
Supplemental disclosure of non-cash financing activities: |  |  |
Property and equipment purchases included in accounts payable | 563,000 | 522,000 | $ 311,000
Estimated fair value of contingent consideration | $ 1,330,000 | 170,000 |
Fair value of common stock issued as consideration for business acquisition |  | $ 2,000,000 |

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