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Condensed Consolidated Statements of Cash Flows - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net loss | $ (12,916,000) | $ (9,322,000)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Interest expense on Mann Group promissory notes | 1,028,000 | 1,257,000
Stock-based compensation expense | 1,935,000 | 1,128,000
Asset impairment |  | 1,521,000
Depreciation, amortization and accretion | 655,000 | 538,000
Amortization of right-of-use assets | 309,000 | 282,000
Write-off of inventory | 0 | 496,000
Gain on foreign currency translation | (3,838,000) | (1,796,000)
Other, net |  | 19,000
Changes in operating assets and liabilities: |  |
Accounts receivable, net | 645,000 | (1,661,000)
Inventory | (77,000) | 428,000
Prepaid expenses and other current assets | 356,000 | 988,000
Other assets | (97,000) | 40,000
Accounts payable | 1,124,000 | 1,942,000
Accrued expenses and other current liabilities | 8,288,000 | 1,880,000
Deferred revenue | (7,431,000) | (8,235,000)
Operating lease liabilities | (333,000) | (724,000)
Recognized loss on purchase commitments | (2,379,000) |
Net cash used in operating activities | (12,731,000) | (11,219,000)
CASH FLOWS FROM INVESTING ACTIVITIES: |  |
Purchase of debt securities | (30,442,000) |
Purchase of property and equipment | (976,000) | (150,000)
Proceeds from sale of treasury bills |  | 20,000,000
Net cash (used in) provided by investing activities | (31,418,000) | 19,850,000
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Proceeds from the Senior convertible notes | 230,000,000 |
Issuance costs associated with Senior convertible notes | (7,268,000) |
Payment of employment taxes related to vested restricted stock units and exercise of stock options | 397,000 | (317,000)
Net cash provided by financing activities | 224,977,000 | 331,000
NET INCREASE IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH | 180,828,000 | 8,962,000
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD | 67,163,000 | 30,222,000
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD | 247,991,000 | 39,184,000
SUPPLEMENTAL CASH FLOWS DISCLOSURES: |  |
Interest paid in cash, net of amounts capitalized | 1,094,000 | 885,000
NON-CASH INVESTING AND FINANCING ACTIVITIES: |  |
Reclassification of the PPP Loan from current to long-term | 609,000 |
Payment of interest through common stock issuance | 143,000 | 144,000
Common stock issuance to settle employee stock purchase plan liability | 390,000 | 318,000
Non-cash construction in progress and property and equipment | 124,000 | 32,000
2024 Convertible Notes |  |
NON-CASH INVESTING AND FINANCING ACTIVITIES: |  |
Payment of 2024 convertible notes through common stock issuance | 5,000,000 |
Mann Group |  |
NON-CASH INVESTING AND FINANCING ACTIVITIES: |  |
Payment of convertible notes through common stock issuance | 9,573,000 |
Payment of interest through common stock issuance | 427,000 |
At The Market Issuance |  |
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Proceeds from at-the-market offering | 1,886,000 | 668,000
Issuance costs associated with at-the-market offering | $ (38,000) | $ (20,000)

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