CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Cash flows from operating activities:
Net income (loss)	$ 3,952	$ (12,150)	$ (7,230)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization	1,888	1,929	8,460
Asset write-downs and impairment of field equipment	6	75	398
Share-based compensation	16,557	9,649	52,416
Foreign currency remeasurement loss (gain)	(7)	0	(917)
Decrease (increase) in accounts receivables	(19,718)	(2,036)	(36,496)
Amortization of discount (premium)	(539)	(578)	(2,176)
Decrease (increase) in inventories	1,147	(1,583)	(1,159)
Decrease (increase) in other long-term assets	1,235	(86)	3,446
Increase (decrease) in accounts payables and accrued expenses	(2,339)	2,246	16,883
Increase (decrease) in other long-term liabilities	(225)	(1,781)	(7,006)
Net cash provided by (used in) operating activities	1,957	(4,315)	26,620
Cash flows from investing activities:
Purchase of property, equipment and field equipment	(3,112)	(2,325)	(10,485)
Proceeds from maturity of short-term investments	0	105,661	420,661
Purchase of short-term investments	0	(104,325)	(461,843)
Net cash provided by (used in) investing activities	(3,112)	(989)	(51,667)
Cash flows from financing activities:
Proceeds from issuance of shares, net	0	0	2,467
Repayment of long-term loan	(8)	(8)	(31)
Exercise of options and warrants	4,511	16,978	59,245
Net cash provided by (used in) financing activities	4,503	16,970	61,681
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(59)	(261)	26
Increase (decrease) in cash, cash equivalents and restricted cash	3,289	11,405	36,660
Cash, cash equivalents and restricted cash at the beginning of the period	179,416	142,756	142,756
Cash, cash equivalents and restricted cash at the end of the period	182,705	154,161	179,416
Cash paid during the period for:
Income taxes	2,209	3,033	11,241
Interest	3,415	3,379	13,699
Non-cash activities in accordance with of ASC-842:
Right-of-use assets obtained in exchange for lease obligations	$ 783	$ 15,733	$ 22,943

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-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

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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
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-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(2)
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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

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