CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
CURRENT ASSETS:
Cash and cash equivalents	$ 349,124	$ 234,674
Short-term investments	549,907	607,902
Restricted cash	11,463	11,499
Trade receivables, net	90,436	96,699
Receivables and prepaid expenses	17,946	21,245
Inventories	26,690	27,422
Total current assets	1,045,566	999,441
LONG-TERM ASSETS:
Property and equipment, net	11,857	11,395
Field equipment, net	12,042	11,230
Right-of-use assets	16,964	19,009
Other long-term assets	10,630	10,908
Total long-term assets	51,493	52,542
TOTAL ASSETS	1,097,059	1,051,983
CURRENT LIABILITIES:
Trade payables	56,785	53,647
Other payables, lease liabilities and accrued expenses	59,421	59,965
Total current liabilities	116,206	113,612
LONG-TERM LIABILITIES:
Long-term debt, net	560,562	429,905
Deferred revenue	8,352	12,139
Long-term leases	11,944	14,293
Employee benefits	2,553	5,171
Other long-term liabilities	173	337
Total long-term liabilities	583,584	461,845
TOTAL LIABILITIES	699,790	575,457
COMMITMENTS AND CONTINGENCIES
SHAREHOLDERS' EQUITY:
Ordinary shares no par value, unlimited shares authorized; issued and outstanding: 103,641,238 shares and 102,334,276 shares at June 30, 2021 (unaudited) and December 31, 2020, respectively	0	0
Additional paid-in capital	1,044,732	1,111,435
Accumulated other comprehensive income (loss)	(1,119)	(3,832)
Retained earnings (accumulated deficit)	(646,344)	(631,077)
TOTAL SHAREHOLDERS' EQUITY	397,269	476,526
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 1,097,059	$ 1,051,983