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Cash, Cash Equivalents and Marketable Securities (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Cash, Cash Equivalents and Marketable Securities    
Cash, cash equivalents and marketable securities, unrealized gains $ 13 $ 12
Cash, cash equivalents and marketable securities, unrealized losses (2) (8)
Cost    
Cash, Cash Equivalents and Marketable Securities    
Cash and cash equivalents 45,537 46,024
Total cash, cash equivalents and marketable securities 88,241 97,686
Fair value    
Cash, Cash Equivalents and Marketable Securities    
Cash and cash equivalents 45,537 46,024
Total cash, cash equivalents and marketable securities 88,252 97,690
Corporate debt securities due within 1 year of date of purchase    
Cash, Cash Equivalents and Marketable Securities    
Marketable securities, Unrealized gains 13 12
Marketable securities, Unrealized losses (2) (8)
Corporate debt securities due within 1 year of date of purchase | Cost    
Cash, Cash Equivalents and Marketable Securities    
Marketable securities 42,704 51,662
Corporate debt securities due within 1 year of date of purchase | Fair value | Level 2    
Cash, Cash Equivalents and Marketable Securities    
Marketable securities 42,715 51,666
Cash and money market funds | Cost    
Cash, Cash Equivalents and Marketable Securities    
Cash and cash equivalents 42,038 45,004
Cash and money market funds | Fair value | Level 1    
Cash, Cash Equivalents and Marketable Securities    
Cash and cash equivalents 42,038 45,004
Corporate debt securities due within 3 months of date of purchase | Cost    
Cash, Cash Equivalents and Marketable Securities    
Cash and cash equivalents 3,499 1,020
Corporate debt securities due within 3 months of date of purchase | Fair value | Level 2    
Cash, Cash Equivalents and Marketable Securities    
Cash and cash equivalents $ 3,499 $ 1,020
Maximum | Corporate debt securities due within 1 year of date of purchase    
Cash, Cash Equivalents and Marketable Securities    
Maturity period from date of purchase to classify an investment as marketable securities 1 year 1 year
Maximum | Corporate debt securities due within 3 months of date of purchase    
Cash, Cash Equivalents and Marketable Securities    
Maturity period from date of purchase to classify an investment as cash and cash equivalents 3 months 3 months