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v3.20.1

Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating activities: |  |  |
Net loss | $ (108,897) | $ (101,252) | $ (65,782)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |
Depreciation and amortization | 724 | 770 | 704
Loss (gain) on disposal of property and equipment |  | 7 | (12)
Stock-based compensation expense | 17,719 | 9,396 | 12,621
Amortization of debt issuance costs | 1,278 | 885 | 876
Amortization of premium/discount on investments | 117 | 110 | 157
Change in fair value of foreign currency derivative | 347 | 1,049 | 966
Changes in operating assets and liabilities: |  |  |
Receivables | (17,853) | 1,824 | 2,651
Inventory | 1,649 | (1,649) | 500
Prepaid expenses and other assets | (1,364) | (866) | 951
Accounts payable and accrued expenses | 11,741 | 4,487 | 3,842
Interest payable | 3,056 | (247) | 3,105
Deferred revenue | 1,899 | (7,079) | (1,722)
Net cash used in operating activities: | (89,584) | (92,565) | (41,143)
Investing activities: |  |  |
Acquisition of property and equipment | (343) | (366) | (328)
Proceeds from sale of property and equipment |  |  | 12
Purchases of investments | (3,018) | (62,614) | (107,787)
Sales and maturities of investments | 81,295 | 67,748 | 43,461
Net cash provided by (used in) investing activities: | 77,934 | 4,768 | (64,642)
Financing activities: |  |  |
Sale of common stock, net | 58,500 | 53,400 | 134,000
Sale of pre-funded warrants | 19,882 |  |
Net proceeds from common stock issued under stock-based compensation plans | 1,239 | 2,852 | 1,581
Proceeds from senior credit facility | 19,477 | 10,353 |
Payment of senior credit facility |  | (4,025) |
(Decrease) increase in lease financing obligation |  | (76) | 122
Net cash provided by financing activities: | 99,098 | 62,504 | 135,703
Increase (decrease) in cash, cash equivalents and restricted cash | 87,448 | (25,293) | 29,918
Cash, cash equivalents and restricted cash at beginning of year | 28,275 | 53,568 | 23,650
Cash, cash equivalents and restricted cash at end of year | $ 115,723 | $ 28,275 | $ 53,568

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- Definition Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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