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Fair Value of Financial Instruments - Financial Instruments Outstanding (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Estimated fair values of financial instruments
Cash and cash equivalents, cost	$ 2,784	$ 8,766	$ 10,008	$ 5,640
Cash and cash equivalents, fair value	$ 2,784	8,766
Short-term investments.
Estimated fair values of financial instruments
Total		1,002
Fair Value		1,002
Short-term investments. | U.S. government-sponsored enterprise bonds
Estimated fair values of financial instruments
Total		762
Fair Value		762
Short-term investments. | Corporate notes
Estimated fair values of financial instruments
Total		240
Fair Value		$ 240

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

+ References

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-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash
-URI http://asc.fasb.org/extlink&oid=6506951

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+ References

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