Segment Reporting (Details) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2021 USD ($)		Jun. 30, 2020 USD ($)		Jun. 30, 2021 USD ($) Segment	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment						2
Revenue		$ 118,745		$ 115,736		$ 227,128	$ 268,136
Segment operating income (loss)		12,800		(2,567)		24,422	(111,540)
Total assets (at end of period)		598,425		614,441		598,425	614,441	$ 568,579
Capital expenditures		2,884		3,065		5,657	6,406
Depreciation and amortization		4,751		5,425		9,622	10,866
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue		0		0		0	0
Reservoir Description [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue		78,252		88,442		154,738	191,144
Segment operating income (loss)		7,265		13,534		17,317	24,596
Total assets (at end of period)		335,617		321,003		335,617	321,003
Capital expenditures		2,653		1,820		5,053	3,232
Depreciation and amortization		3,060		3,452		6,187	6,974
Reservoir Description [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue		70		62		127	162
Production Enhancement [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue		40,493		27,294		72,390	76,992
Segment operating income (loss)		3,831		(16,324)		5,391	(137,623)
Total assets (at end of period)		134,146		133,133		134,146	133,133
Capital expenditures		214		1,198		518	3,112
Depreciation and amortization		1,444		1,706		2,891	3,347
Production Enhancement [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue		41		88		77	404
Corporate and Other [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue		0		0		0	0
Segment operating income (loss)		1,704	[1]	223	[1]	1,714	1,487
Total assets (at end of period)	[1]	128,662		160,305		128,662	160,305
Capital expenditures		17	[1]	47	[1]	86	62
Depreciation and amortization		247	[1]	267	[1]	544	545
Corporate and Other [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue		$ (111)	[1]	$ (150)	[1]	$ (204)	$ (566)

[1] "Corporate & Other" represents those items that are not directly related to a particular segment and eliminations.