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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Operating activities: |  |
Net loss | $ (55,261) | $ (103,223)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Stock-based compensation expense | 10,468 | 8,896
Non-cash interest expense | 6,790 | 4,308
Depreciation and amortization | 1,262 | 654
Changes in operating assets and liabilities: |  |
Receivables | (7,113) | 14,847
Inventory | (1,085) | 229
Prepaid expenses and other assets | 959 | (2,608)
Accounts payable and accrued expenses | 6,921 | (2,183)
Net cash used in operating activities | (37,059) | (79,080)
Investing activities: |  |
Purchases of property and equipment | (318) | (474)
Purchases of investments | (594) | (45,514)
Proceeds from the sale and maturities of investments | 36,750 | 73,500
Net cash provided by investing activities | 35,838 | 27,512
Financing activities: |  |
Proceeds from borrowings under notes payable |  | 44,550
Proceeds upon exercise of stock options and warrants | 5,034 | 6,720
Release in restricted investments |  | 56
Payments on finance lease liabilities | (813) |
Payments on finance lease liabilities |  | (365)
Net cash provided by financing activities | 4,221 | 50,961
Net increase (decrease) in cash and cash equivalents | 3,000 | (607)
Cash and cash equivalents at beginning of period | 5,861 | 3,394
Cash and cash equivalents at end of period | 8,861 | 2,787
Supplemental cash flow information |  |
Cash paid for interest | 6,811 | 6,796
Conversion of accrued interest to notes payable |  | 3,246
Fair value of warrants issued in connection with notes payable amendment |  | 1,424
Property acquired under finance lease | $ 886 | $ 579

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