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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
OPERATING ACTIVITIES: |  |  |
Net income | $ 9,861 | $ 11,145 | $ 6,691
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |
Depreciation and amortization | 3,589 | 3,434 | 3,182
Bad debt expense |  | 80 | 10
Interest amortization / write-off of deferred financing costs | 284 | 104 | 100
Stock-based compensation expense | 2,021 | 936 | 470
Deferred income taxes, net | (1,821) | 1,322 | 171
Impairment of goodwill |  |  | 9,738
Revaluation of contingent consideration liability |  | (6,069) | (11,056)
Operating lease assets and liabilities, net | 18 | 100 |
Loss on disposition of fixed assets | 4 |  | 7
Long-term accrued income taxes | (20) | (19) | 136
Working capital items: |  |  |
Accounts receivable and unbilled receivables | 2,133 | 5,648 | (7,428)
Prepaid and other current assets | 251 | (386) | 283
Accounts payable | (1,613) | (100) | (901)
Accrued payroll and related costs | 6,287 | 174 | (1,241)
Other accrued liabilities | 91 | (264) | (461)
Deferred revenue | 146 | (21) | (172)
Net cash flows provided by (used in) operating activities | 21,231 | 16,084 | (471)
INVESTING ACTIVITIES: |  |  |
Acquisition of AmberLeaf (net of cash acquired and issuance of contingent consideration) | (9,345) |  |
Recovery of (payments for) non-current deposits | 9 | 135 | (285)
Capital expenditures | (298) | (1,014) | (771)
Net cash flows (used in) investing activities | (9,634) | (879) | (1,056)
FINANCING ACTIVITIES: |  |  |
(Repayments) borrowing on revolving credit facility, net | (9,551) | (3,976) | 4,526
Borrowing on term loan facility | 17,500 |  |
(Repayments) on term loan facility | (15,969) | (9,575) | (4,003)
Proceeds from the issuance of common stock | 222 | 168 |
Payment of deferred financing costs | (246) |  | (71)
Purchase of treasury stock |  | (13) | (20)
Proceeds from the exercise of stock options | 1,330 | 7 | 118
Net cash flows provided by (used in) financing activities | (6,714) | (13,389) | 550
Effect of exchange rate changes on cash and cash equivalents | (187) | (129) | (207)
Net change in cash and cash equivalents | 4,696 | 1,687 | (1,184)
Cash and cash equivalents, beginning of period | 2,981 | 1,294 | 2,478
Cash and cash equivalents, end of period | 7,677 | 2,981 | 1,294
SUPPLEMENTAL DISCLOSURE: |  |  |
Cash payments for interest expense | 779 | 1,780 | 2,060
Cash payments for income taxes | $ 2,681 | $ 2,634 | $ 2,031

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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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