Restructuring Expenses (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2019 USD ($)	Dec. 31, 2020 USD ($) ft² Position	Dec. 31, 2019 USD ($) Engineer Office	Dec. 01, 2019 ft²
Restructuring Cost and Reserve [Line Items]
Lease abandonment restructuring charges			$ 1,500
Abandoned Square Footage and Right Out Use Asset [Abstract]
Square Ft in use | ft²		24,572		56,420
Abandoned Square Ft | ft²		31,849
Pre-Abandonment ROU Balance		$ 2,765
Post-Abandonment Balance		1,236
Abandonment ROU Balance		1,529
Restructuring charges		1,297	2,478
Restructuring Costs [Abstract]
Restructuring costs		$ 1,297	2,478
Sykesville [Member]
Abandoned Square Footage and Right Out Use Asset [Abstract]
Square Ft in use | ft²		14,636		36,549
Abandoned Square Ft | ft²		21,913
Pre-Abandonment ROU Balance		$ 1,474
Post-Abandonment Balance		590
Abandonment ROU Balance		$ 884
DP Engineering Ltd, Co. [Member]
Abandoned Square Footage and Right Out Use Asset [Abstract]
Square Ft in use | ft²		9,936		19,871
Abandoned Square Ft | ft²		9,936
Pre-Abandonment ROU Balance		$ 1,291
Post-Abandonment Balance		646
Abandonment ROU Balance		646
Lease Abandonment [Member]
Restructuring Cost and Reserve [Line Items]
Lease abandonment restructuring charges		0	1,500
Lease Termination Costs [Member]
Restructuring Costs [Abstract]
Restructuring costs		$ 0	$ 1,625
International Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected number of positions eliminated | Position		40
Total Restructuring charges		$ 3,100
Cumulative translation adjustment		1,200
Tax benefit		800
Reduction in workforce | Engineer			12
Number of offices leases terminated | Office			1
Abandoned Square Footage and Right Out Use Asset [Abstract]
Restructuring charges		1,000	$ 100
Restructuring Costs [Abstract]
Restructuring costs		1,119	106
International Restructuring [Member] | DP Engineering Ltd, Co. [Member]
Restructuring Cost and Reserve [Line Items]
Early termination fees related to lease	$ 300
Restructuring Costs [Abstract]
Restructuring costs		200	700
Employee Termination Benefits [Member]
Restructuring Costs [Abstract]
Restructuring costs		$ 178	$ 747