Organization and Summary of Significant Accounting Policies (Marketable Securities Sold) (Details) - USD ($)	1 Months Ended	12 Months Ended
	Jan. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Investments in Privately Held Companies
Proceeds from sales of marketable securities		$ 9,717,000
Realized gains on available-for-sale marketable securities		3,208,000	$ 0	$ 0
Amount reclassified out of accumulated other comprehensive income		1,854,000
Invitae
Investments in Privately Held Companies
Fair value		9,300,000	18,100,000
Carrying value		7,300,000		13,900,000
Amount reclassified out of accumulated other comprehensive income		1,900,000	$ 0	$ 0
Amount reclassified out of accumulated other comprehensive income, tax portion		727,000
Common Stock | Sale | Invitae
Investments in Privately Held Companies
Proceeds from sales of marketable securities	$ 10,200,000	$ 9,700,000
Cost per share (in dollars per share)		$ 6.28
Realized gains on available-for-sale marketable securities	$ 2,800,000	$ 3,200,000
Number of shares of cost method investment sold by entity			0