MULTICLIENT SEISMIC DATA LIBRARY, NET - Changes in Carrying Value of Multiclient Seismic Data Library (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Multiclient Data Library [Abstract]
Balance at beginning of year	$ 4,733	$ 5,829
Amortization	(2,014)	(1,096)
Balance at end of year	$ 2,719	$ 4,733