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Fair Value of Financial Instruments - Financial Instruments Outstanding (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Estimated fair values of financial instruments
Cash and cash equivalents, cost	$ 8,766	$ 5,640	$ 3,110	$ 4,364
Cash and cash equivalents, fair value	8,766	5,640
Short-term investments.
Estimated fair values of financial instruments
Total	1,002	14,614
Unrealized Losses		16
Fair Value	1,002	14,598
Short-term investments. | U.S. government-sponsored enterprise bonds
Estimated fair values of financial instruments
Total	762	6,243
Fair Value	762	6,243
Short-term investments. | Municipal Bonds
Estimated fair values of financial instruments
Total		200
Fair Value		200
Short-term investments. | Corporate notes
Estimated fair values of financial instruments
Total	240	8,171
Unrealized Losses		16
Fair Value	$ 240	$ 8,155

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

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