Unbilled Accounts Receivable (Details)	6 Months Ended	12 Months Ended
Jun. 30, 2018	Dec. 31, 2017
U.S. Department of Homeland Security HQ [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
As a % of Receivables	12.00%	11.00%
U.S. Immigration and Customs Enforcement [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
As a % of Receivables	27.00%	27.00%
U.S. Transportation Safety Administration [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
As a % of Receivables	12.00%	12.00%
U.S. Customs Border Patrol [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
As a % of Receivables	17.00%	0.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration