Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

Summary of Significant Accounting Policies [Abstract]

Disaggregation of Revenue

We have one reportable segment. We treat sales to U.S. customers as sales within the U.S. regardless of where the services are performed. Substantially all of our revenues are from U.S. customers as revenue derived from international customers is de minimus. The following tables disclose revenue (in thousands) by customer type and contract type for the years ended December 31, 2020, 2019, and 2018.  Prior period amounts have not been adjusted under the modified retrospective method.

	2020		2019		2018
Federal	$	171,677	$	149,257	$	129,279
State & Local, and Commercial		8,240		9,961		8,737
Total	$	179,917	$	159,218	$	138,016

	2020		2019		2018
Firm fixed-price	$	151,703	$	131,629	$	103,454
Time-and-materials		13,455		14,569		16,795
Cost plus fixed fee		14,759		13,020		17,767
Total	$	179,917	$	159,218	$	138,016

Allowance for Obsolescent Inventory

The components of the allowance for inventory obsolescence are set forth below (in thousands):

	Balance Beginning of Year		Additions Charge to Costs and Expense			Recoveries			Balance End of Year
Year Ended December 31, 2020	$	860	$	(1	)	$	(8	)	$	851
Year Ended December 31, 2019	$	520	$	376		$	(36	)	$	860
Year Ended December 31, 2018	$	1,484	$	30		$	(994	)	$	520

Property and Equipment Useful Lives

Property and equipment is recorded at cost. Depreciation is provided using the straight-line method at rates based on the estimated useful lives of the individual assets or classes of assets as follows:

Furniture and equipment	3-5   Years
Leasehold improvements	Lesser of life of lease or useful life of asset
Property and equipment under finance leases	Lesser of life of lease or useful life of asset

Potentially Dilutive Securities not Included in Calculation of Diluted Net Earnings (Loss) per Share

Potentially dilutive securities not included in the calculation of diluted net earnings (loss) per share because to do so would be anti-dilutive are as follows (in common stock equivalent shares):

	Year Ended December 31,
	2020		2019
Unvested restricted stock		60		945
Common stock warrants, exercisable at $1.665/sh.		901		901
Total		961		1,846