Organization and Summary of Significant Accounting Policies - Additional Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019		Mar. 31, 2018	Jan. 01, 2019	Dec. 31, 2018		Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Restricted cash	$ 116		$ 561		$ 269
Impairment of Real Estate	0		0
Cumulative Effect of New Accounting Principle in Period of Adoption							$ (3,365)
Deferred Tax Assets - ASC 606	13,937				13,937
Selling and Marketing Expense - ASC 606	8,679		6,639
Depreciation of Capitalized Sales and Marketing	2,600		900
Stock Repurchased During Period	1,042
Right of use lease asset	2,755	[1]		$ 3,100	0	[1]
Operating Lease, Liability	3,196	[2]		$ 3,500	0
Non-controlling interest in subsidiary	76				76
Impairments related to investment in unconsolidated joint ventures	0		$ 0
Allowance for doubtful contracts and accounts receivable	$ 0				0
Maximum [Member]
Equity Method Investment, Ownership Percentage	35.00%
Additional Paid-in Capital [Member]
Stock Repurchased During Period	$ 1,040
Common Stock [Member]
Stock Repurchased and Retired During Period, Shares	153,916
Stock Repurchased During Period	$ 2
Stockholders' Equity Attributable to Parent [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption							$ (3,365)
Stock Repurchased During Period	1,042
Stock Options and Restricted Stock Units
Unearned stock-based compensation expense not yet recognized	$ 2,900
Accounting Standards Update 2018-07 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption					$ 18
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Fee Building Segment [Member]
Concentration Risk, Percentage	33.00%		48.00%

[1] In conjunction with the adoption of ASC 842 the Company established a right-of-use asset of $3.1 million on January 1, 2019. For more information, please refer to Note

[2] The weighted average remaining lease term and weighted average discount rate used in calculating our lease liabilities were 2.2 years and 5.2%, respectively at March 31, 2019.