The Company and Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Reclassification
Retained earnings	$ 50,551		$ 39,924
Commission Expense	500
Restricted cash	$ 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