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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES |  |
Net earnings (loss) | $ (895) | $ 2,322
Adjustments to reconcile net earnings (loss) to net cash provided by (used in) operating activities: |  |
Depreciation and amortization | 3,174 | 3,193
Impairment of right of use assets | 612 |
Payment of earnout related to Ambrell acquisition |  | (12,167)
Provision for excess and obsolete inventory | 444 | 391
Foreign exchange loss | 26 | 3
Amortization of deferred compensation related to stock-based awards | 671 | 884
Proceeds from sale of demonstration equipment, net of gain | 82 | 167
Loss on disposal of property and equipment | 22 | 55
Deferred income tax benefit | (341) | (426)
Changes in assets and liabilities: |  |
Trade accounts receivable | 887 | 1,244
Inventories | (717) | (1,058)
Prepaid expenses and other current assets | 35 | (129)
Restricted certificates of deposit |  | 35
Other assets | (4) | (1)
Accounts payable | 430 | 197
Accrued wages and benefits | (70) | (912)
Accrued professional fees | (31) | 31
Customer deposits and deferred revenue | (62) | (797)
Accrued sales commission | 29 | (261)
Operating lease liabilities | (1,297) | (1,378)
Domestic and foreign income taxes payable | (48) | 171
Other current liabilities | 301 | 31
Net cash provided by (used in) operating activities | 3,248 | (8,405)
CASH FLOWS FROM INVESTING ACTIVITIES |  |
Purchase of property and equipment | (658) | (620)
Proceeds from sale of property and equipment | 10 |
Net cash used in investing activities | (648) | (620)
CASH FLOWS FROM FINANCING ACTIVITIES |  |
Proceeds from Paycheck Protection Program loans | 2,829 |
Repayments of Paycheck Protection Program loans | (2,829) |
Proceeds from revolving credit facility | 2,800 |
Repayments of revolving credit facility | (2,800) |
Repurchases of common stock | (74) | (1,142)
Net cash used in financing activities | (74) | (1,142)
Effects of exchange rates on cash | 139 | (82)
Net cash provided by (used in) all activities | 2,665 | (10,249)
Cash and cash equivalents at beginning of period | 7,612 | 17,861
Cash and cash equivalents at end of period | 10,277 | 7,612
Cash payments for: |  |
Domestic and foreign income taxes | 54 | 535
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES: |  |
Issuance of unvested shares of restricted stock | 971 | 837
Forfeiture of unvested shares of restricted stock | $ (405) | $ (88)

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