The Company and Summary of Significant Accounting Policies Background (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2016	Dec. 31, 2015
Valuation Allowance [Abstract]
Accumulated deficit	$ (150,326)	$ (132,346)
Deferred Tax Assets, Valuation Allowance	$ 40,436	$ 40,070	$ 45,255	$ 42,339