Purchase of Telos ID/Non-Controlling Interests (Details)				1 Months Ended		12 Months Ended
	Nov. 23, 2020 USD ($) $ / shares shares	Dec. 24, 2014 USD ($) Director Class	Apr. 20, 2007 USD ($)	Jan. 31, 2021 USD ($)	Apr. 19, 2007	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Apr. 11, 2007 USD ($)
Business Combination [Abstract]
Additional percentage of ownership interest						50.00%
Net book value of assets [Abstract]
Net income						$ 6,841,000	$ (2,137,000)	$ 1,737,000
Changes in non-controlling interest [Abstract]
Non-controlling interest, beginning of period				$ 0		4,514,000
Net income						5,154,000	4,264,000	3,377,000
Distributions						(5,179,000)	(2,371,000)	(1,669,000)
Sale of 50% membership interest						(30,000,000)
Non-controlling interest, end of period						0	4,514,000
Noncontrolling Interest [Member]
Net book value of assets [Abstract]
Net income						5,154,000	4,264,000	3,377,000
Changes in non-controlling interest [Abstract]
Non-controlling interest, beginning of period				0		4,514,000	2,621,000	913,000
Net income						5,154,000	4,264,000	3,377,000
Distributions						(5,179,000)	(2,371,000)	(1,669,000)
Sale of 50% membership interest						(4,489,000)	0	0
Non-controlling interest, end of period						0	4,514,000	2,621,000
Class A Membership Unit [Member]
Net book value of assets [Abstract]
Net income						5,200,000	4,300,000	3,400,000
Class B Membership Unit [Member]
Net book value of assets [Abstract]
Net income						$ 2,800,000	$ 2,400,000	$ 1,700,000
Class B Membership Unit [Member] | Subsequent Events [Member]
Changes in non-controlling interest [Abstract]
Distributions				$ (2,400,000)
Telos ID [Member]
Net book value of assets [Abstract]
Net book value of assets contributed									$ 17,000
Percentage of membership interest owned before					99.999%
Owned membership interest from private equity investors					0.001%
Percentage of membership interest sold to investor		10.00%	39.999%
Cash consideration received on sale of membership interest		$ 5,000,000	$ 6,000,000
Recognized gain on sale of membership interests to the Investors			$ 5,800,000
Number of members in board of director | Director		5
Number of classes of membership units | Class		2
Telos ID [Member] | Class A Membership Unit [Member]
Net book value of assets [Abstract]
Percentage of ownership interest owned after transaction		50.00%	60.00%
Percentage of profit and loss allocated		50.00%
Number of directors entitled to be appointed | Director		3
Telos ID [Member] | Class B Membership Unit [Member]
Net book value of assets [Abstract]
Percentage of ownership interest owned after transaction		50.00%
Percentage of profit and loss allocated		50.00%
Number of directors entitled to be appointed | Director		2
Telos ID [Member]
Business Combination [Abstract]
Cash payment for acquisition	$ 30,000,000
Number of shares issued in acquisition (in shares) | shares	7,278,040
Share price (in dollars per share) | $ / shares	$ 20.39
Value of stock issued	$ 148,400,000
Total consideration transferred	178,400,000
Issuance of common stock on APIC	148,400,000
Non-controlling interest in APIC	$ 173,900,000
Additional percentage of ownership interest	50.00%
Impact of ownership interest on APIC	$ 25,500,000