Income Taxes (Deferred Taxes) (Details 2) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Stock-based compensation expense	$ 2,222	$ 3,137
Deferred rent	2,172	2,369
Compensation and benefits payable	1,938	2,606
Federal unrecognized tax benefit	38	51
Other	(23)	4
Total deferred tax assets	6,347	8,167
Deferred tax liabilities:
Property and equipment	(359)	(620)
Intangibles	(911)	(448)
Unrealized gains on investments	(833)	(17)
Total deferred tax liabilities	(4,131)	(3,065)
Net deferred tax assets	2,216	5,102
Deferred Tax Liabilities, Leasing Arrangements	$ (2,028)	$ (1,980)