Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net income (loss)	$ (7,230)	$ (63,559)	$ (61,662)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	8,460	9,006	7,677
Asset write-downs and impairment of field equipment	398	407	241
Share-based compensation	52,416	39,846	27,116
Foreign currency remeasurement loss (gain)	(917)	0	0
Decrease (increase) in accounts receivables	(36,496)	(10,325)	(21,249)
Amortization of discount (premium)	(2,176)	1,022	252
Decrease (increase) in inventories	(1,159)	(529)	3,524
Decrease (increase) in other long-term assets	3,446	(949)	(554)
Increase (decrease) in accounts payables and accrued expenses	16,883	13,713	13,310
Increase (decrease) in other long-term liabilities	(7,006)	9,503	(1,789)
Net cash provided by (used in) operating activities	26,620	(1,865)	(33,134)
Cash flows from investing activities:
Purchase of property, equipment and field equipment	(10,485)	(6,711)	(7,366)
Proceeds from maturity of short-term investments	420,661	255,000	120,000
Purchase of short-term investments	(461,843)	(253,782)	(104,006)
Net cash provided by (used in) investing activities	(51,667)	(5,493)	8,628
Cash flows from financing activities:
Proceeds from issuance of shares, net	2,467	1,835	1,540
Proceeds from long-term loan, net	0	149,150	19
Repayment of long-term loan	(31)	(100,084)	(76)
Exercise of options and warrants	59,245	18,468	3,685
Net cash provided by financing activities	61,681	69,369	5,168
Effect of exchange rate changes on cash, cash equivalents and restricted cash	26	27	8
Increase (decrease) in cash, cash equivalents and restricted cash	36,660	62,038	(19,330)
Cash, cash equivalents and restricted cash at the beginning of the year	142,756	80,718	100,048
Cash, cash equivalents and restricted cash at the end of the year	179,416	142,756	80,718
Cash paid during the year for:
Income taxes	11,241	20,350	10,286
Interest	13,699	$ 13,334	$ 10,162
Non-cash activities in accordance with ASC-842:
Right-of-use assets obtained in exchange for lease liabilities	$ 22,943

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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