Business Segments (Details 1) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenue	$ 123,088,000	$ 473,107,000	$ 583,290,000	$ 515,160,000
Additions to property, plant and equipment		1,630,000	2,315,000	2,834,000
Depreciation and amortization		7,879,000	9,482,000	7,921,000
Identifiable assets:
Total assets	381,776,000	381,776,000	448,902,000
Automotive Market Sector
Segment Reporting Information [Line Items]
Revenue		117,796,000	165,129,000	116,077,000
Financial and Insurance Market Sector
Segment Reporting Information [Line Items]
Revenue		77,889,000	93,149,000	100,116,000
Defense & Aerospace Market Sector
Segment Reporting Information [Line Items]
Revenue		77,927,000	78,682,000	61,723,000
Technology Market Sector
Segment Reporting Information [Line Items]
Revenue		34,122,000	37,609,000	39,521,000
Other Market Sector
Segment Reporting Information [Line Items]
Revenue		165,373,000	208,721,000	197,723,000
Organizational Performance Solutions
Segment Reporting Information [Line Items]
Revenue		185,443,000	225,363,000	208,689,000
Technical Performance Solutions
Segment Reporting Information [Line Items]
Revenue		183,844,000	215,029,000	207,561,000
Automotive Performance Solutions
Segment Reporting Information [Line Items]
Revenue		103,820,000	142,898,000	98,910,000
Corporate and other
Segment Reporting Information [Line Items]
Depreciation and amortization		1,377,000	1,402,000	732,000
United States
Segment Reporting Information [Line Items]
Revenue		303,384,000	374,017,000	344,720,000
Identifiable assets:
Total assets	230,693,000	230,693,000	255,649,000
United Kingdom
Segment Reporting Information [Line Items]
Revenue		74,291,000	86,511,000	92,059,000
Identifiable assets:
Total assets	72,562,000	72,562,000	72,939,000
Canada
Identifiable assets:
Total assets	3,656,000	3,656,000	43,503,000
Other
Segment Reporting Information [Line Items]
Revenue		95,432,000	122,762,000	78,381,000
Identifiable assets:
Total assets	74,865,000	74,865,000	76,811,000
North America
Segment Reporting Information [Line Items]
Revenue		317,735,000	395,603,000	366,481,000
Depreciation and amortization		7,879,000	9,482,000	7,921,000
Identifiable assets:
Total assets	231,708,000	231,708,000	308,941,000
North America | Automotive Market Sector
Segment Reporting Information [Line Items]
Revenue		86,686,000	116,260,000	105,780,000
North America | Financial and Insurance Market Sector
Segment Reporting Information [Line Items]
Revenue		37,428,000	37,610,000	46,861,000
North America | Defense & Aerospace Market Sector
Segment Reporting Information [Line Items]
Revenue		72,908,000	69,903,000	53,789,000
North America | Technology Market Sector
Segment Reporting Information [Line Items]
Revenue		29,901,000	33,284,000	34,881,000
North America | Other Market Sector
Segment Reporting Information [Line Items]
Revenue		90,812,000	138,546,000	125,170,000
North America | Organizational Performance Solutions
Segment Reporting Information [Line Items]
Revenue		121,955,000	141,134,000	129,107,000
North America | Technical Performance Solutions
Segment Reporting Information [Line Items]
Revenue		120,904,000	152,513,000	143,562,000
North America | Automotive Performance Solutions
Segment Reporting Information [Line Items]
Revenue		74,876,000	101,956,000	93,812,000
North America | Operating Segments
Segment Reporting Information [Line Items]
Additions to property, plant and equipment		795,000	1,048,000	2,003,000
Depreciation and amortization		4,350,000	5,202,000	4,955,000
EMEA
Segment Reporting Information [Line Items]
Revenue		107,203,000	125,118,000	116,296,000
Identifiable assets:
Total assets	110,468,000	110,468,000	101,892,000
EMEA | Automotive Market Sector
Segment Reporting Information [Line Items]
Revenue		7,495,000	15,757,000	2,627,000
EMEA | Financial and Insurance Market Sector
Segment Reporting Information [Line Items]
Revenue		25,822,000	34,104,000	35,452,000
EMEA | Defense & Aerospace Market Sector
Segment Reporting Information [Line Items]
Revenue		5,019,000	8,779,000	7,918,000
EMEA | Technology Market Sector
Segment Reporting Information [Line Items]
Revenue		2,887,000	3,953,000	4,476,000
EMEA | Other Market Sector
Segment Reporting Information [Line Items]
Revenue		65,980,000	62,525,000	65,823,000
EMEA | Organizational Performance Solutions
Segment Reporting Information [Line Items]
Revenue		39,924,000	51,976,000	52,730,000
EMEA | Technical Performance Solutions
Segment Reporting Information [Line Items]
Revenue		62,283,000	61,302,000	62,199,000
EMEA | Automotive Performance Solutions
Segment Reporting Information [Line Items]
Revenue		4,996,000	11,840,000	1,367,000
EMEA | Operating Segments
Segment Reporting Information [Line Items]
Additions to property, plant and equipment		492,000	937,000	694,000
Depreciation and amortization		1,376,000	1,788,000	1,997,000
Emerging Markets
Segment Reporting Information [Line Items]
Revenue		48,169,000	62,569,000	32,383,000
Identifiable assets:
Total assets	$ 39,600,000	39,600,000	38,069,000
Emerging Markets | Automotive Market Sector
Segment Reporting Information [Line Items]
Revenue		23,615,000	33,112,000	7,670,000
Emerging Markets | Financial and Insurance Market Sector
Segment Reporting Information [Line Items]
Revenue		14,639,000	21,435,000	17,803,000
Emerging Markets | Defense & Aerospace Market Sector
Segment Reporting Information [Line Items]
Revenue		0	0	16,000
Emerging Markets | Technology Market Sector
Segment Reporting Information [Line Items]
Revenue		1,334,000	372,000	164,000
Emerging Markets | Other Market Sector
Segment Reporting Information [Line Items]
Revenue		8,581,000	7,650,000	6,730,000
Emerging Markets | Organizational Performance Solutions
Segment Reporting Information [Line Items]
Revenue		23,564,000	32,253,000	26,852,000
Emerging Markets | Technical Performance Solutions
Segment Reporting Information [Line Items]
Revenue		657,000	1,214,000	1,800,000
Emerging Markets | Automotive Performance Solutions
Segment Reporting Information [Line Items]
Revenue		23,948,000	29,102,000	3,731,000
Emerging Markets | Operating Segments
Segment Reporting Information [Line Items]
Additions to property, plant and equipment		343,000	330,000	137,000
Depreciation and amortization		$ 776,000	$ 1,090,000	$ 237,000