Company and Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Significant Accounting Policies [Line Items]
Impairment charges	$ 0	$ 0		$ 0
Computer Equipment [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life (in years)			3 years
Office Equipment [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life (in years)			3 years
Office Equipment [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life (in years)			10 years
Furniture and Fixtures [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life (in years)			5 years
Furniture and Fixtures [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life (in years)			10 years