Revenue Recognition (Tables)

9 Months Ended

Sep. 30, 2021

Revenue Recognition and Deferred Revenue [Abstract]

Disaggregation of Revenue

The following tables disclose revenue (in thousands) by customer type and contract type for the three and nine months ended September 30, 2021 and 2020.

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Federal	$	67,697	$	45,788	$	171,091	$	128,756
State & Local, and Commercial	2,369		1,652		7,292		6,273
Total	$	70,066	$	47,440	$	178,383	$	135,029

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Firm-fixed-price	$	61,434	$	39,483	$	155,832	$	113,080
Time-and-materials	3,154		3,605		9,243		11,066
Cost plus fixed fee	5,478		4,352		13,308		10,883
Total	$	70,066	$	47,440	$	178,383	$	135,029

Contract with Customer, Contract Asset, Contract Liability, and Receivable

The following table provides information about accounts receivable, contract assets and contract liabilities (in thousands):

	September 30, 2021		December 31, 2020
Billed accounts receivable	$	10,158	$	12,060
Unbilled receivables	39,717		19,161
Allowance for doubtful accounts	(116)		(308)
Accounts receivable – net	$	49,759	$	30,913
Contract liabilities	$	7,232	$	5,654

Significant changes in the contract liabilities balance (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Revenue recognized that was included in the opening contract liability balance	$	823	$	1,690	$	4,065	$	5,208

	September 30, 2021		December 31, 2020
	(in thousands)		(in thousands)
Remaining performance obligations (funded backlog)	$	163,351	$	127,735