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Fair Value of Financial Instruments - Outstanding (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
Estimated fair values of financial instruments
Cash and cash equivalents, cost	$ 10,980	$ 5,640	$ 5,602	$ 3,110
Cash and cash equivalents, fair value	10,980	5,640
Short-term investments.
Estimated fair values of financial instruments
Cost	5,543	14,614
Unrealized Losses		(16)
Fair Value	5,543	14,598
Short-term investments. | U.S. government-sponsored enterprise bonds
Estimated fair values of financial instruments
Cost	1,085	6,243
Fair Value	1,085	6,243
Short-term investments. | Municipal Bonds
Estimated fair values of financial instruments
Cost		200
Fair Value		200
Short-term investments. | Corporate notes
Estimated fair values of financial instruments
Cost	4,458	8,171
Unrealized Losses		(16)
Fair Value	$ 4,458	$ 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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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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