Property, Plant, and Equipment (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 5,947,000		$ 5,947,000		$ 6,110,000
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(4,746,000)		(4,746,000)		(5,815,000)
Property and equipment, net of accumulated depreciation and amortization of $4,746 and $5,815, respectively	1,201,000		1,201,000		295,000
Noncash or Part Noncash Divestiture, Amount of Consideration Received	1.1
Payments to Acquire Other Property, Plant, and Equipment			1,000,000.0
Asset Impairment Charges	0	$ 1,600,000	0	$ 1,600,000
Computer Equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	3,176,000		$ 3,176,000		3,826,000
Computer Equipment | Minimum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives			3
Computer Equipment | Maximum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives			5
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	1,719,000		$ 1,719,000		1,867,000
Furniture and Fixtures | Minimum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives			5
Furniture and Fixtures | Maximum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives			7
Leaseholds and Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 1,052,000		$ 1,052,000		$ 417,000
Leaseholds and Leasehold Improvements | Minimum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives			3
Leaseholds and Leasehold Improvements | Maximum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives			7