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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
Fair Value of Financial Instruments
Cash and cash equivalents, cost	$ 1,585	$ 3,110	$ 4,685	$ 4,364
Cash and cash equivalents, fair value	1,585	3,110
Estimated fair values of financial instruments
Unrealized Gains	2	3
Unrealized Losses	(5)	(13)
Short-term investments.
Estimated fair values of financial instruments
Cost	21,599	20,442
Unrealized Gains	2	3
Unrealized Losses	(4)	(6)
Fair Value	21,597	20,439
Short-term investments. | U.S. government-sponsored enterprise bonds
Estimated fair values of financial instruments
Cost	8,439	1,250
Unrealized Gains	2
Unrealized Losses	(1)
Fair Value	8,440	1,250
Short-term investments. | Corporate notes
Estimated fair values of financial instruments
Cost	11,924	15,921
Unrealized Gains		2
Unrealized Losses	(3)	(6)
Fair Value	11,921	15,917
Short-term investments. | Municipal Bonds
Estimated fair values of financial instruments
Cost	996	841
Fair Value	996	841
Short-term investments. | Certificates of deposit
Estimated fair values of financial instruments
Cost	240	2,430
Unrealized Gains		1
Fair Value	240	2,431
Long-term investments
Estimated fair values of financial instruments
Cost	2,270	2,252
Unrealized Losses	(1)	(7)
Fair Value	2,269	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	2,270	1,252
Unrealized Losses	(1)	(5)
Fair Value	$ 2,269	$ 1,247

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