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Cash and Cash Equivalents and Fair Value of Financial Instruments - Assets Measured at Fair Value (Details) (USD $) | 6 Months Ended |  |  |  |  |  |
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Jun. 30, 2014 | Jun. 30, 2014 Money Market Funds | Dec. 31, 2013 Money Market Funds | Jun. 30, 2014 Fair Value, Measurements, Recurring [Member] Money Market Funds | Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Money Market Funds | Jun. 30, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] Money Market Funds | Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] Money Market Funds
Cash and Cash Equivalents [Line Items] |  |  |  |  |  |  |
Money Market Fund - daily traded value | $ 1.00 |  |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure |  | $ 58,046,000 | $ 65,708,000 | $ 58,046,000 | $ 65,708,000 | $ 58,046,000 | $ 65,708,000

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- 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 + Details
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