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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Cash flows from operating activities: |  |
Net loss | $ (27,939) | $ (18,439)
Adjustments to reconcile net loss to net cash used in operating activities |  |
Depreciation and amortization | 4,279 | 3,382
Noncash operating lease cost | 1,048 | 673
Stock-based compensation expense | 4,761 | 3,657
Loss on debt extinguishment |  | 1,704
Change in fair value of convertible preferred stock warrant liability |  | 1,403
Accretion of noncash interest and debt reduction |  | 156
Other | 63 | 73
Changes in operating assets and liabilities |  |
Accounts receivable | (2,603) | (75)
Inventory and other deferred costs | (1,662) | (1,173)
Prepaid expenses and other current assets | (2,065) | (3,410)
Accounts payable | (1,628) | 474
Accrued and other current liabilities | 1,174 | 988
Contract liabilities | (15,383) | (9,170)
Operating lease liabilities | (637) | (717)
Other long-term liabilities | 471 |
Net cash used in operating activities | (40,121) | (20,474)
Cash flows from investing activities: |  |
Purchases of available-for-sale debt securities | (80,104) | (40,262)
Proceeds from maturities of available-for-sale debt securities | 80,510 |
Purchases of property and equipment | (2,409) | (6,469)
Net cash used in investing activities | (2,003) | (46,731)
Cash flows from financing activities: |  |
Proceeds from public offerings, net of underwriting discounts and commissions | 117,500 | 144,025
Payments of costs related to public offerings | (93) | (3,950)
Proceeds from borrowings |  | 20,000
Payments of borrowing costs |  | (490)
Repayments under borrowing arrangements |  | (25,000)
Debt extinguishment costs |  | (794)
Proceeds from exercise of common stock warrants |  | 8
Proceeds from exercise or settlement of equity awards | 2,920 | 678
Net cash provided by financing activities | 120,327 | 134,477
Effect of exchange rates on cash flows and cash equivalents | (4) | (3)
Net change in cash and cash equivalents | 78,199 | 67,269
Cash and cash equivalents, beginning of period | 55,046 | 19,744
Cash and cash equivalents, end of period | $ 133,245 | $ 87,013

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