CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Cash flows from operating activities:
Net income (loss)	$ (24,008)	$ (14,641)	$ (28,655)	$ (18,769)	$ (58,351)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization	2,654	2,480	5,264	4,850	10,251
Accrued Interest	(602)	0	(823)	0	(94)
Asset write-downs and impairment of field equipment	216	178	351	354	649
Share-based compensation	25,823	27,881	50,868	46,744	94,900
Foreign currency remeasurement loss (gain)	943	372	1,192	2,529	3,231
Decrease (increase) in accounts receivables	2,257	3,026	(5,204)	7,649	5,270
Amortization of discount (premium)	827	925	1,511	1,528	3,101
Decrease (increase) in inventories	(209)	1,663	(5,013)	367	2,483
Decrease (increase) in other long-term assets	2,356	1,584	4,219	3,016	4,519
Increase (decrease) in accounts payables and accrued expenses	7,649	5,122	(7,160)	2,496	27,777
Increase (decrease) in other long-term liabilities	(2,144)	(2,418)	(4,475)	(6,812)	(10,980)
Net cash provided by (used in) operating activities	15,762	26,172	12,075	43,952	82,756
Cash flows from investing activities:
Purchase of property, equipment and field equipment	(4,131)	(2,618)	(9,224)	(6,599)	(24,170)
Proceeds from maturity of short-term investments	437,034	0	716,034	608,000	958,000
Purchase of short-term investments	(277,146)	0	(568,463)	(549,848)	(1,078,664)
Net cash provided by (used in) investing activities	155,757	(2,618)	138,347	51,553	(144,834)
Cash flows from financing activities:
Proceeds from issuance of shares, net	2,759	2,371	2,759	2,371	4,546
Repayment of long-term debt	(7)	(7)	(14)	(13)	(26)
Exercise of options	1,984	8,695	5,132	16,656	21,182
Net cash provided by (used in) financing activities	4,736	11,059	7,877	19,014	25,702
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(120)	(3)	(145)	(105)	(188)
Increase (decrease) in cash, cash equivalents and restricted cash	176,135	34,610	158,154	114,414	(36,564)
Cash, cash equivalents and restricted cash at the beginning of the period	191,628	325,977	209,609	246,173	246,173
Cash, cash equivalents and restricted cash at the end of the period	367,763	360,587	367,763	360,587	209,609
Cash paid during the period for:
Income taxes paid (refunded), net	1,854	2,490	3,027	85	3,110
Interest paid	1	1	2	2	101
Non-cash activities:
Right-of-use assets obtained in exchange for lease liabilities	$ 279	$ 665	$ 3,859	$ 949	$ 5,387