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v3.20.2

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019
Operating activities |  |
Net loss | $ (76,206) | $ (68,683)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation and amortization | 401 | 357
Stock-based compensation expense | 6,034 | 8,702
Amortization of debt issuance costs | 681 | 596
Amortization of premium/discount on investments | 104 | (17)
Change in fair value of foreign currency derivative | 590 | 646
Changes in operating assets and liabilities: |  |
Receivables | 18,149 | 691
Inventory | (5,233) | 649
Prepaid expenses and other assets | 817 | 84
Accounts payable and accrued expenses | (1,156) | 2,579
Interest payable | 2,902 | 2,897
Deferred revenue | (1,405) | 0
Net cash used in operating activities | (54,322) | (51,499)
Investing activities |  |
Acquisitions of property and equipment | (187) | (180)
Purchases of investments | (15,438) | (3,018)
Sales and maturities of investments | 21,417 | 41,357
Net cash provided by investing activities | 5,792 | 38,159
Financing activities |  |
Sale of common stock, net | 92,848 | 0
Sale of pre-funded warrants | 14,817 | 0
Proceeds from senior credit facility | 0 | 19,477
Net proceeds from common stock issued under stock-based compensation plans | 798 | 977
Net cash provided by (used in) financing activities | 108,463 | 20,454
Increase in cash, cash equivalents and restricted cash | 59,933 | 7,114
Cash, cash equivalents and restricted cash at beginning of period | 115,723 | 28,275
Cash, cash equivalents and restricted cash at end of period | $ 175,656 | $ 35,389

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