Company and Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Significant Accounting Policies [Line Items]
Tangible Asset Impairment Charges	$ 0	$ 0
Computer Equipment [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life (in years)	3 years
Minimum [Member] | Office Equipment [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life (in years)	3 years
Minimum [Member] | Furniture and Fixtures [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life (in years)	5 years
Maximum [Member] | Office Equipment [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life (in years)	10 years
Maximum [Member] | Furniture and Fixtures [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life (in years)	10 years