Organization and Summary of Significant Accounting Policies, Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balances	[1]	$ 71,346	$ 95,721	$ 95,396
Current-period other comprehensive gain (loss)	[1]	(27)	(274)	(154)
Balances	[1]	57,308	71,346	95,721
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balances		(2,302)	(2,028)	(1,874)
Current-period other comprehensive gain (loss)		(27)	(274)	(154)
Balances		(2,329)	(2,302)	(2,028)
Foreign Currency Translation Losses [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balances		(2,211)	(1,975)
Current-period other comprehensive gain (loss)		(77)	(236)
Balances		(2,288)	(2,211)	(1,975)
Unrealized Gains (Losses) on Investments [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balances		(91)	(53)
Current-period other comprehensive gain (loss)		50	(38)
Balances		$ (41)	$ (91)	$ (53)

[1] Prior periods adjusted to reflect the impact of the one-for-three reverse stock split that became effective on January 20, 2017, as discussed in Note 1.