Commitments and Contingencies (Detail Textual)	Dec. 31, 2016 USD ($)
Minimum | Government Contracting
Loss Contingencies [Line Items]
Estimated amount of possible loss	$ 0
Minimum | Government Contracting | Incurred Cost Submissions
Loss Contingencies [Line Items]
Estimated amount of possible loss	0
Minimum | Virginia Sales and Use Tax Audit
Loss Contingencies [Line Items]
Estimated amount of possible loss	1,000,000
Maximum | Government Contracting
Loss Contingencies [Line Items]
Estimated amount of possible loss	3,900,000
Maximum | Government Contracting | Incurred Cost Submissions
Loss Contingencies [Line Items]
Estimated amount of possible loss	1,000,000
Maximum | Virginia Sales and Use Tax Audit
Loss Contingencies [Line Items]
Estimated amount of possible loss	$ 2,500,000