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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Cash flows from operating activities: |  |  |
Net loss | $ (5,027) | $ (18,537) |
Adjustments to reconcile net loss to net cash provided by (used in) operating activities: |  |  |
Depreciation and amortization | 1,251 | 1,940 |
Asset impairments |  | 22,750 |
(Gain) loss on sale of fixed assets, net | (25) | 9 |
Stock-based compensation expense | 571 | 313 |
Changes in operating assets and liabilities: |  |  |
Contract receivables and retainage, net | (7,657) | (2,779) |
Contract assets | 2,065 | (3,851) |
Prepaid expenses, inventory and other current assets | (2,070) | 228 |
Accounts payable | 346 | 1,756 |
Contract liabilities | (2,450) | (3,317) |
Accrued expenses and other current liabilities | 1,792 | 2,199 |
Noncurrent assets and liabilities, net | (147) | (353) |
Net cash provided by (used in) operating activities | (11,351) | 358 |
Cash flows from investing activities: |  |  |
Capital expenditures | (440) | (460) |
Proceeds from sale of property and equipment | 25 | 39 |
Net cash used in investing activities | (415) | (421) |
Cash flows from financing activities: |  |  |
Tax payments for vested stock withholdings | (59) | (100) |
Net cash used in financing activities | (59) | (100) |
Net decrease in cash, cash equivalents and restricted cash | (11,825) | (163) |
Cash, cash equivalents and restricted cash, beginning of period | 54,589 | 43,159 | $ 43,159
Cash, cash equivalents and restricted cash, end of period | $ 42,764 | $ 42,996 | $ 54,589

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- Definition The cash inflow from sale of machinery and equipment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3179-108585 + Details
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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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