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Fair Value of Financial Instruments - Outstanding (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Estimated fair values of financial instruments
Cash and cash equivalents, cost	$ 5,640	$ 3,110	$ 4,364	$ 2,529
Cash and cash equivalents, fair value	5,640	3,110
Unrealized Gains		3
Unrealized Losses	(16)	(13)
Short-term investments.
Estimated fair values of financial instruments
Cost	14,614	20,442
Unrealized Gains		3
Unrealized Losses	(16)	(6)
Fair Value	14,598	20,439
Short-term investments. | U.S. government-sponsored enterprise bonds
Estimated fair values of financial instruments
Cost	6,243	1,250
Fair Value	6,243	1,250
Short-term investments. | Municipal Bonds
Estimated fair values of financial instruments
Cost	200	841
Fair Value	200	841
Short-term investments. | Corporate notes
Estimated fair values of financial instruments
Cost	8,171	15,921
Unrealized Gains		2
Unrealized Losses	(16)	(6)
Fair Value	$ 8,155	15,917
Short-term investments. | Certificates of deposit
Estimated fair values of financial instruments
Cost		2,430
Unrealized Gains		1
Fair Value		2,431
Long-term investments
Estimated fair values of financial instruments
Cost		2,252
Unrealized Losses		(7)
Fair Value		2,245
Long-term investments | U.S. government-sponsored enterprise bonds
Estimated fair values of financial instruments
Cost		1,000
Unrealized Losses		(2)
Fair Value		998
Long-term investments | Corporate notes
Estimated fair values of financial instruments
Cost		1,252
Unrealized Losses		(5)
Fair Value		$ 1,247

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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