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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Cash flows from operating activities: |  |
Net loss | $ (11,969) | $ (15,069)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation and lease asset amortization | 6,463 | 7,264
Other amortization, net | 48 | 37
Bad debt expense |  | 59
Asset impairments |  | 622
(Gain) loss on sale of assets held for sale, net | 72 | (369)
(Gain) loss on sale of fixed assets and other assets, net | (5) | (565)
Stock-based compensation expense | 781 | 1,808
Changes in operating assets and liabilities: |  |
Contracts receivable and retainage, net | 1,659 | (7,822)
Contract assets | (20,232) | (20,873)
Prepaid expenses, inventory and other current assets | 1,713 | 1,502
Accounts payable | 18,900 | 29,244
Contract liabilities | (6,094) | (1,164)
Accrued expenses and other current liabilities | (656) | (470)
Noncurrent assets and liabilities, net (including long-term retainage) | 2,043 | (910)
Net cash used in operating activities | (7,277) | (6,706)
Cash flows from investing activities: |  |
Capital expenditures | (10,191) | (1,990)
Proceeds from sale of property, plant and equipment | 1,679 | 1,598
Purchases of short-term investments | (19,992) | (45,366)
Maturities of short-term investments | 20,000 | 28,761
Net cash used in investing activities | (8,504) | (16,997)
Cash flows from financing activities: |  |
Proceeds from borrowings | 10,000 |
Payment of financing cost | (70) | (48)
Tax payments for vested stock withholdings | (74) | (795)
Net cash provided by (used in) financing activities | 9,856 | (843)
Net decrease in cash and cash equivalents | (5,925) | (24,546)
Cash and cash equivalents, beginning of period | 49,703 | 70,457
Cash and cash equivalents, end of period | $ 43,778 | $ 45,911

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- Definition The cash inflow from maturities, prepayments, calls and collections of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details
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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=121586364&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=121586364&loc=d3e3602-108585 + Details
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