CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
CURRENT ASSETS:
Cash and cash equivalents	$ 314,547	$ 234,674
Short-term investments	549,855	607,902
Restricted cash	11,430	11,499
Trade receivables, net	92,514	96,699
Receivables and prepaid expenses	18,922	21,245
Inventories	27,968	27,422
Total current assets	1,015,236	999,441
LONG-TERM ASSETS:
Property and equipment, net	11,733	11,395
Field equipment, net	12,132	11,230
Right-of-use assets	17,741	19,009
Other long-term assets	10,788	10,908
Total long-term assets	52,394	52,542
TOTAL ASSETS	1,067,630	1,051,983
CURRENT LIABILITIES:
Trade payables	52,703	53,647
Other payables, lease liabilities and accrued expenses	57,784	59,965
Total current liabilities	110,487	113,612
LONG-TERM LIABILITIES:
Long-term debt, net	559,584	429,905
Deferred revenue	9,577	12,139
Long-term leases	12,708	14,293
Employee benefits	2,963	5,171
Other long-term liabilities	177	337
Total long-term liabilities	585,009	461,845
TOTAL LIABILITIES	695,496	575,457
COMMITMENTS AND CONTINGENCIES
SHAREHOLDERS' EQUITY:
Ordinary shares no par value, unlimited shares authorized; issued and outstanding: 103,187,460 shares and 102,334,276 shares at March 31, 2021 (unaudited) and December 31, 2020, respectively	0	0
Additional paid-in capital	1,005,785	1,111,435
Accumulated other comprehensive income (loss)	(1,948)	(3,832)
Retained earnings (accumulated deficit)	(631,703)	(631,077)
TOTAL SHAREHOLDERS' EQUITY	372,134	476,526
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 1,067,630	$ 1,051,983