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Statements of Cash Flows - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Cash Flows from Operating Activities: |  |  |  |
Net loss |  |  | $ (102,493) | $ (88,387)
Adjustments to reconcile net loss to operating cash flow: |  |  |  |
Depreciation | $ 577 | $ 475 | 2,018 | 1,900
Amortization of intangible assets | 44 | 44 | 177 | 178
Equity-based compensation expense | 1,021 | 3,122 | 6,441 | 3,718
Accrued interest on convertible note payable |  |  | 127 | 701
Net noncash change in right of use assets and lease liabilities | 406 | 378 | 1,501 | 1,486
Changes in assets and liabilities: |  |  |  |
Prepaid expenses and other assets | (1,371) | 91 | (1,540) | (462)
Accounts receivable | (2,716) | (7,071) | (2,043) | 18,042
Accounts payable and accrued expenses | (646) | (5,525) | 5,886 | 6,493
Lease liability | (452) | (411) | (1,650) | (1,594)
Deferred DOE cost share | (105) | 161 | (13,254) | 13,358
Deferred revenue | (773) | (32) | 1,148 | 224
Accrued compensation | (5,763) | 1,647 | 4,520 | (2,892)
Net cash used in operating activities | (33,151) | (29,787) | (99,162) | (47,235)
Cash Flows from Investing Activities |  |  |  |
Purchases of property, plant and equipment | (1,187) | (111) | (1,952) | (3,526)
Net cash used in investing activities | (1,187) | (111) | (1,952) | (3,526)
Cash Flows from Financing Activities: |  |  |  |
Proceeds from debt issuance |  | 22,700 |  | 23,000
Repayment of debt |  |  | (20,000) | (3,000)
Proceeds from short-term borrowings |  |  | 27,200 |
Repayment of short-term borrowings |  |  | (27,200) |
Proceeds from sale of convertible preferred units |  | 40,500 | 192,500 | 18,500
Proceeds from exercise of common unit options | 470 | 11 | 748 | 43
Repurchase of common units | (563) |  | (17) | (49)
Issuance of treasury units | 20 |  | 113 |
Net cash used in financing activities | (73) | 63,211 | 173,344 | 38,494
Net change in cash | (34,411) | 33,313 | 72,230 | (12,267)
Cash and cash equivalents: |  |  |  |
Cash - beginning of the period | 77,094 | 4,864 | 4,864 | 17,131
Cash - ending of the period | $ 42,683 | 38,177 | 77,094 | 4,864
Summary of noncash investing and financing activities: |  |  |  |
Conversion of accounts payable to convertible preferred units |  | $ 39 | 65 | 378
Capital expenditures in accounts payable |  |  |  | 290
Equity issuance fees |  |  | 1,960 |
Increase in lease liability |  |  |  | $ 846
Supplemental disclosures of cash flow information: |  |  |  |
Cash paid for interest |  |  | $ 1,478 |

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