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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Operating Activities: |  |
Consolidated net loss | $ (101,282) | $ (67,936)
Adjustments to reconcile consolidated net loss to cash provided by (used in) operating activities: |  |
Depreciation and amortization of intangibles | 47,909 | 40,849
Asset impairment | 29,292 |
Loss on debt extinguishment | 6,517 |
Deferred income taxes | 2 | 27
Inventory valuation |  | (350)
(Gain) loss on derivative instruments | (555) | 6,714
Amortization of deferred financing costs | 511 | 900
Amortization of debt discounts | 689 | 720
Noncash compensation | 2,809 | 3,438
Bad debt expense | 27 | 45
Interest expense added to Senior Notes | 1,185 |
Changes in operating assets and liabilities: |  |
Accounts receivable | (6,698) | 12,663
Inventories | (2,780) | 4,080
Prepaid expenses and other assets | 10,197 | (3,880)
Prepaid inventory | 1,562 | 191
Operating leases | (10,161) |
Accounts payable and accrued expenses | (2,587) | 4,105
Net cash provided by (used in) operating activities | (23,363) | 1,566
Investing Activities: |  |
Additions to property and equipment | (3,281) | (15,154)
Net cash used in investing activities | (3,281) | (15,154)
Financing Activities: |  |
Proceeds from issuances of common stock | 3,670 | 2,057
Proceeds from CoGen contract amendment | 8,036 |
Proceeds from assessment financing |  | 2,043
Payments on assessment financing |  | (415)
Net proceeds (payments) on Kinergy's line of credit | 21,282 | 7,578
Payments on plant borrowings | (8,000) | (16,500)
Payments on senior notes | (3,748) | (2,000)
Preferred stock dividend payments | (946) | (1,265)
Payments on capital leases |  | (772)
Debt issuance costs | (1,280) |
Net cash provided by (used in) financing activities | 19,014 | (9,274)
Net decrease in cash and cash equivalents | (7,630) | (22,862)
Cash and cash equivalents at beginning of period | 26,627 | 49,489
Cash and cash equivalents at end of period | 18,997 | 26,627
Supplemental Information: |  |
Interest paid | 18,763 | 15,147
Income tax refunds |  | 743
Noncash financing and investing activities: |  |
Initial right of use assets and liabilities recorded under ASC 842 | 43,753 |
Issuance of common stock for senior note amendment | 3,817 |
Issuance of warrants for senior note amendment | 979 |
Accrued preferred stock dividends | $ 319 |

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