The Company and Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Reclassification
Capitalization of internally developed software costs	$ 800	$ 800
Capitalized Computer Software, Unamortized	700	700
Amortization expense for capitalized internally developed software	100	100
Investment in privately held company	2,500	2,500		$ 0
Retained earnings	45,808	45,808		39,924
Commission Expense	500
Restricted cash	$ 1,200	$ 1,200		$ 1,200
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
Reclassification
Retained earnings			$ 2,700
Commission asset balance			3,500
Deferred tax liability			$ 800