Organization and Significant Accounting Policies - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	$ (1,556)
Total other comprehensive (loss)	(12)	$ (1,108)	$ (485)
Balance, end of period	(1,568)	(1,556)
Foreign currency translation
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	(1,568)	(471)
Total other comprehensive (loss)	(6)	(1,097)
Balance, end of period	(1,574)	(1,568)	(471)
Available-for-sale marketable securities
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	12	23
Other comprehensive (loss):	(6)	(11)
Balance, end of period	6	12	$ 23
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	(1,556)
Balance, end of period	$ (1,568)	$ (1,556)