Restructuring Expenses (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) ft² Position Engineer Office	Dec. 31, 2018 USD ($)	Dec. 01, 2019 ft²
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected number of positions eliminated | Position		40
Expected restructuring costs		$ 2,478	$ 2,200
Cumulative translation adjustment		1,300
Tax benefit		1,000
Payments		$ 54
Reduction in workforce | Engineer		12
Number of offices leases terminated | Office		1
Lease termination costs	$ 300
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		2,478	1,269
Restructuring Costs [Abstract]
Total Expected Restructuring Costs		2,478	2,200
Restructuring costs		$ 2,478	$ 1,300
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]
Restructuring Cost and Reserve [Line Items]
Lease termination costs		$ 300
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
Restructuring charges		500
Lease Abandonment [Member]
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs		1,529
Restructuring Costs [Abstract]
Total Expected Restructuring Costs		1,529
Restructuring costs		1,529
Lease Abandonment Costs [Member]
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs		57
Restructuring Costs [Abstract]
Total Expected Restructuring Costs		57
Restructuring costs		57
Lease Termination Costs [Member]
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs		39
Restructuring Costs [Abstract]
Total Expected Restructuring Costs		39
Restructuring costs		39
International Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs		106
Restructuring Costs [Abstract]
Total Expected Restructuring Costs		106
Restructuring costs		106
Employee Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs		747
Restructuring Costs [Abstract]
Total Expected Restructuring Costs		747
Restructuring costs		$ 747