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Cash and Cash Equivalents (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash and Cash Equivalents      
Cash $ 5,870us-gaap_Cash $ 4,670us-gaap_Cash  
Investments with original maturity of less than three months at the time of purchase 18,319us-gaap_ShortTermInvestments 26,476us-gaap_ShortTermInvestments  
Total cash and cash equivalents $ 24,189us-gaap_CashAndCashEquivalentsAtCarryingValue $ 31,146us-gaap_CashAndCashEquivalentsAtCarryingValue $ 16,412us-gaap_CashAndCashEquivalentsAtCarryingValue