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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Cash flows from operating activities: |  |  |  |  |
Net income (loss) | $ 1,930 | $ (11,694) | $ (11,490) | $ (47,928) | $ (63,559)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities: |  |  |  |  |
Depreciation and amortization | 1,932 | 2,311 | 5,993 | 6,801 | 9,006
Asset write-downs and impairment of field equipment | 78 | 178 | 239 | 320 | 407
Amortization of discount (premium) | (547) | (555) | (1,712) | 1,502 | 1,022
Share-based compensation to employees | 14,338 | 10,479 | 37,719 | 29,205 | 39,846
Decrease (increase) in accounts receivables | (9,986) | 3,577 | (17,020) | (4,805) | (10,325)
Decrease (increase) in inventories | 1,067 | (1,735) | (1,832) | 385 | (529)
Increase (decrease) in accounts payable and accrued expenses | 6,433 | 2,839 | 10,902 | (2,760) | 13,713
Decrease (increase) in other long-term assets | 1,069 | 155 | 1,151 | (743) | (949)
Increase (decrease) in other long-term liabilities | (1,407) | 83 | (4,292) | (656) | 9,503
Net cash provided by (used in) operating activities | 14,907 | 5,638 | 19,658 | (18,679) | (1,865)
Cash flows from investing activities: |  |  |  |  |
Purchase of property, equipment and field equipment | (2,708) | (1,353) | (7,430) | (4,918) | (6,711)
Proceeds from maturity of short-term investments | 105,000 | 45,000 | 315,661 | 150,000 | 255,000
Purchase of short-term investments | (104,466) | (44,652) | (313,142) | (148,786) | (253,782)
Net cash provided by (used in) investing activities | (2,174) | (1,005) | (4,911) | (3,704) | (5,493)
Cash flows from financing activities: |  |  |  |  |
Proceeds from issuance of shares, net | 0 | 0 | 1,208 | 938 | 1,835
Proceeds from long-term loan, net | 0 | 0 | 0 | 149,150 | 149,150
Repayment of long-term loan | (7) | (22) | (23) | (100,063) | (100,084)
Exercise of options and warrants | 15,475 | 3,924 | 51,910 | 16,779 | 18,468
Net cash provided by (used in) financing activities | 15,468 | 3,902 | 53,095 | 66,804 | 69,369
Effect of foreign currency translation | (216) | (2) | (430) | 19 | 27
Increase (decrease) in cash, cash equivalents and restricted cash | 27,985 | 8,533 | 67,412 | 44,440 | 62,038
Cash, cash equivalents and restricted cash at the beginning of the period | 182,183 | 116,625 | 142,756 | 80,718 | 80,718
Cash, cash equivalents and restricted cash at the end of the period | 210,168 | 125,158 | 210,168 | 125,158 | 142,756
Cash paid during the period for: |  |  |  |  |
Income taxes | 3,040 | 4,145 | 10,431 | 16,159 | 20,350
Interest | 3,453 | 3,454 | 10,247 | 9,879 | 13,334
Non-cash activities in accordance with of ASC-842: |  |  |  |  |
Right-of-use assets obtained in exchange for lease obligations | $ 1,062 | $ 0 | $ 18,335 | $ 0 | $ 0

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- Definition Amount of increase in right-of-use asset obtained in exchange for operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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