CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
CURRENT ASSETS:
Cash and cash equivalents	$ 80,190	$ 99,780
Short-term investments	104,186	119,854
Restricted cash	1,537	267
Trade receivables	13,888	6,339
Receivables and prepaid expenses	11,544	10,084
Inventories	25,147	25,549
Total current assets	236,492	261,873
LONG-TERM ASSETS:
Property and equipment, net	9,621	9,812
Field equipment, net	9,061	8,808
Severance pay fund	102	88
Other long-term assets	1,766	1,500
Total long-term assets	20,550	20,208
TOTAL ASSETS	257,042	282,081
CURRENT LIABILITIES:
Trade payables	13,161	18,356
Other payables and accrued expenses	22,010	18,526
Total current liabilities	35,171	36,882
LONG-TERM LIABILITIES:
Long-term loan, net of discount and issuance costs	96,765	96,231
Employee benefit liabilities	2,679	2,590
Other long-term liabilities	4,882	4,033
Total long-term liabilities	104,326	102,854
TOTAL LIABILITIES	139,497	139,736
COMMITMENTS AND CONTINGENCIES	0	0
SHAREHOLDERS' EQUITY:
Ordinary shares no par value, unlimited shares authorized; issued and outstanding: 88,630,205 shares and 87,066,446 shares at June 30, 2017 (unaudited) and December 31, 2016, respectively	0	0
Additional paid-in capital	679,099	664,154
Accumulated other comprehensive loss	(1,739)	(1,883)
Accumulated deficit	(559,815)	(519,926)
Total shareholders' equity	117,545	142,345
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 257,042	$ 282,081