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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Fair Value of Financial Instruments
Cash and cash equivalents, cost	$ 5,602	$ 3,110	$ 3,040	$ 4,364
Cash and cash equivalents, fair value	5,602	3,110
Estimated fair values of financial instruments
Unrealized Gains	1	3
Unrealized Losses	(10)	(13)
Short-term investments.
Estimated fair values of financial instruments
Cost	26,388	20,442
Unrealized Gains	1	3
Unrealized Losses	(5)	(6)
Fair Value	26,384	20,439
Short-term investments. | U.S. government-sponsored enterprise bonds
Estimated fair values of financial instruments
Cost	8,197	1,250
Unrealized Losses	(1)
Fair Value	8,196	1,250
Short-term investments. | Municipal Bonds
Estimated fair values of financial instruments
Cost	3,101	841
Fair Value	3,101	841
Short-term investments. | Corporate notes
Estimated fair values of financial instruments
Cost	13,482	15,921
Unrealized Gains	1	2
Unrealized Losses	(4)	(6)
Fair Value	13,479	15,917
Short-term investments. | Certificates of deposit
Estimated fair values of financial instruments
Cost	1,108	2,430
Unrealized Gains		1
Fair Value	1,108	2,431
Short-term investments. | Commercial Paper
Estimated fair values of financial instruments
Cost	500
Fair Value	500
Long-term investments
Estimated fair values of financial instruments
Cost	3,291	2,252
Unrealized Losses	(5)	(7)
Fair Value	3,286	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	3,291	1,252
Unrealized Losses	(5)	(5)
Fair Value	$ 3,286	$ 1,247

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