CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 111,603	$ 78,592
Short-term investments	104,712	104,719
Restricted cash	2,158	2,126
Trade receivables	34,044	29,567
Receivables and prepaid expenses	9,939	8,105
Inventories	20,386	22,025
Total current assets	282,842	245,134
LONG-TERM ASSETS:
Property and equipment, net	8,902	9,031
Field equipment, net	9,020	9,036
Severance pay fund	113	111
Other long-term assets	2,602	1,986
Total long-term assets	20,637	20,164
TOTAL ASSETS	303,479	265,298
CURRENT LIABILITIES:
Trade payables	19,419	17,206
Other payables and accrued expenses	25,340	32,996
Total current liabilities	44,759	50,202
LONG-TERM LIABILITIES:
Long-term loan, net of discount and issuance costs	149,160	97,342
Employee benefit liabilities	2,522	2,453
Other long-term liabilities	920	1,737
Total long-term liabilities	152,602	101,532
TOTAL LIABILITIES	197,361	151,734
COMMITMENTS AND CONTINGENCIES	0	0
SHAREHOLDERS' EQUITY:
Ordinary shares no par value, unlimited shares authorized; issued and outstanding: 90,398,901 shares and 89,478,032 shares at March 31, 2018 (unaudited) and December 31, 2017, respectively	0	0
Additional paid-in capital	708,266	697,165
Accumulated other comprehensive loss	(1,328)	(1,343)
Accumulated deficit	(600,820)	(582,258)
Total shareholders' equity	106,118	113,564
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 303,479	$ 265,298