Organization and Summary of Significant Accounting Policies, Intangible Assets (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2009
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 272,000	$ 273,000	$ 273,000	$ 273,000	$ 316,000	$ 335,000	$ 335,000	$ 335,000	$ 1,091,000	$ 1,321,000	$ 1,522,000
Purchased Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired												350,000
Amortization of intangible assets										62,000	81,000
Developed Computer Software
Acquired Finite-Lived Intangible Assets [Line Items]
Impairment of software developed for internal use									$ 0	$ 0	$ 70,000