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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash flows from operating activities: |  |  |
Net loss | $ (27,375) | $ (49,394) | $ (20,378)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |
Depreciation and lease asset amortization | 8,617 | 9,564 | 10,350
Other amortization, net | 63 | 50 | 80
Bad debt expense |  | 59 | 30
Asset impairments | 3,310 | 17,223 | 4,445
(Gain) loss on assets held for sale, net | 228 | (369) | (7,724)
Gain on insurance recoveries |  |  | (3,571)
(Gain) loss on sale of fixed assets and other assets, net | (2) | (584) | 268
Stock-based compensation expense | 1,126 | 1,774 | 2,795
Changes in operating assets and liabilities: |  |  |
Contract receivables and retainage, net | 10,702 | (3,650) | 2,962
Contract assets | (15,393) | (22,145) | (26,932)
Prepaid expenses, inventory and other current assets | 1,644 | 2,556 | (3,162)
Accounts payable | 10,042 | 30,950 | 10,515
Contract liabilities | (11,142) | 9,425 | 12,371
Accrued expenses and other current liabilities | (2,427) | (1,099) | (3,352)
Noncurrent assets and liabilities, net (including long-term retainage) | 1,599 | (1,500) | 911
Net cash used in operating activities | (19,008) | (7,140) | (20,392)
Cash flows from investing activities: |  |  |
Capital expenditures | (11,212) | (3,790) | (3,481)
Proceeds from sale of property, plant and equipment | 2,020 | 2,217 | 85,247
Purchases of short-term investments | (58,751) | (65,284) | (9,610)
Maturities of short-term investments | 70,552 | 54,086 | 1,200
Recoveries from insurance claims |  |  | 9,362
Net cash provided by (used in) investing activities | 2,609 | (12,771) | 82,718
Cash flows from financing activities: |  |  |
Proceeds from borrowings | 10,000 |  | 15,000
Repayment of borrowings |  |  | (15,000)
Payment of financing cost | (71) | (48) | (42)
Tax payments for vested stock withholdings | (74) | (795) | (810)
Net cash provided by (used in) financing activities | 9,855 | (843) | (852)
Net increase (decrease) in cash and cash equivalents | (6,544) | (20,754) | 61,474
Cash and cash equivalents, beginning of period | 49,703 | 70,457 | 8,983
Cash and cash equivalents, end of period | 43,159 | 49,703 | 70,457
Supplemental cash flow information: |  |  |
Interest paid | 376 | 470 | 352
Income taxes paid (refunds received), net | (971) | 63 | 6
Reclassification of property, plant and equipment to assets held for sale | 2,115 | 294 |
Reclassification of assets held for sale to property, plant and equipment |  | 1,162 | 866
Accounts payable included in capital expenditures | $ 153 | $ 1,623 |
Reclassification of accrued expenses to assets held for sale |  |  | $ 3,245

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