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Cash and Cash Equivalents, Short-term Investments and Fair Value of Financial Instruments (Details) avail for sasle securities levels 1-2-3 table (USD $)	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Cash and Cash Equivalents [Line Items]
Money Market Fund - daily traded value	$ 1
Cash, Cash Equivalents, and Short-term Investments	107,558,000	104,531,000
Money Market Funds [Member]
Cash and Cash Equivalents [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	54,652,000	65,708,000
Money Market Funds [Member] | Fair Value, Measurements, Recurring [Member]
Cash and Cash Equivalents [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	54,652,000	65,708,000
Money Market Funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and Cash Equivalents [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	$ 54,652,000	$ 65,708,000

X

- Definition

Cash, cash equivalents and short-term investments - fair value disclosure

+ References

No definition available.

+ Details

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X

- Definition

Money Market Fund - daily traded value = $1.00 per share

+ References

No definition available.

+ Details

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X

- Definition

Fair value portion 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.

+ 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



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

-URI http://asc.fasb.org/extlink&oid=6507016

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