CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 122,959	$ 78,592
Short-term investments	104,743	104,719
Restricted cash	2,199	2,126
Trade receivables	35,388	29,567
Receivables and prepaid expenses	9,895	8,105
Inventories	21,641	22,025
Total current assets	296,825	245,134
LONG-TERM ASSETS:
Property and equipment, net	8,564	9,031
Field equipment, net	7,300	9,036
Severance pay fund	114	111
Other long-term assets	2,709	1,986
Total long-term assets	18,687	20,164
TOTAL ASSETS	315,512	265,298
CURRENT LIABILITIES:
Trade payables	20,053	17,206
Other payables and accrued expenses	28,034	32,996
Total current liabilities	48,087	50,202
LONG-TERM LIABILITIES:
Long-term loan, net of discount and issuance costs	149,231	97,342
Employee benefit liabilities	2,347	2,453
Other long-term liabilities	911	1,737
Total long-term liabilities	152,489	101,532
TOTAL LIABILITIES	200,576	151,734
COMMITMENTS AND CONTINGENCIES	0	0
SHAREHOLDERS' EQUITY:
Ordinary shares no par value, unlimited shares authorized; issued and outstanding: 93,007,844 shares and 89,478,032 shares at September 30, 2018 (unaudited) and December 31, 2017, respectively	0	0
Additional paid-in capital	744,087	697,165
Accumulated other comprehensive income (loss)	(1,127)	(1,343)
Retained earnings (accumulated deficit)	(628,024)	(582,258)
Total shareholders' equity	114,936	113,564
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 315,512	$ 265,298