CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 114,456	$ 78,592
Short-term investments	104,499	104,719
Restricted cash	2,169	2,126
Trade receivables	37,643	29,567
Receivables and prepaid expenses	11,216	8,105
Inventories	19,906	22,025
Total current assets	289,889	245,134
LONG-TERM ASSETS:
Property and equipment, net	8,891	9,031
Field equipment, net	8,108	9,036
Severance pay fund	111	111
Other long-term assets	2,877	1,986
Total long-term assets	19,987	20,164
TOTAL ASSETS	309,876	265,298
CURRENT LIABILITIES:
Trade payables	20,434	17,206
Other payables and accrued expenses	24,813	32,996
Total current liabilities	45,247	50,202
LONG-TERM LIABILITIES:
Long-term loan, net of discount and issuance costs	149,195	97,342
Employee benefit liabilities	2,473	2,453
Other long-term liabilities	880	1,737
Total long-term liabilities	152,548	101,532
TOTAL LIABILITIES	197,795	151,734
COMMITMENTS AND CONTINGENCIES	0	0
SHAREHOLDERS' EQUITY:
Ordinary shares no par value, unlimited shares authorized; issued and outstanding: 92,503,273 shares and 89,478,032 shares at June 30, 2018 (unaudited) and December 31, 2017, respectively	0	0
Additional paid-in capital	729,684	697,165
Accumulated other comprehensive loss	(1,273)	(1,343)
Accumulated deficit	(616,330)	(582,258)
Total shareholders' equity	112,081	113,564
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 309,876	$ 265,298