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Cash, Cash Equivalents and Marketable Securities (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Cash, Cash Equivalents and Marketable Securities    
Marketable securities, Unrealized gains $ 6  
Cash, cash equivalents and marketable securities, unrealized gains 6 3
Cash, cash equivalents and marketable securities, unrealized losses   (1)
Cost
   
Cash, Cash Equivalents and Marketable Securities    
Cash and cash equivalents 25,477  
Marketable securities 27,901  
Total cash, cash equivalents and marketable securities 53,378 100,597
Fair value
   
Cash, Cash Equivalents and Marketable Securities    
Cash and cash equivalents 25,477  
Marketable securities 27,907  
Total cash, cash equivalents and marketable securities 53,384 100,599
Corporate debt securities due within 1 year of date of purchase
   
Cash, Cash Equivalents and Marketable Securities    
Marketable securities, Unrealized gains 6 3
Marketable securities, Unrealized losses   (1)
Corporate debt securities due within 1 year of date of purchase | Cost
   
Cash, Cash Equivalents and Marketable Securities    
Marketable securities 27,901 19,085
Corporate debt securities due within 1 year of date of purchase | Fair value | Level 2
   
Cash, Cash Equivalents and Marketable Securities    
Marketable securities 27,907 19,087
Cash and money market funds | Cost
   
Cash, Cash Equivalents and Marketable Securities    
Cash and cash equivalents 23,977 81,512
Cash and money market funds | Fair value | Level 1
   
Cash, Cash Equivalents and Marketable Securities    
Cash and cash equivalents 23,977 81,512
Corporate debt securities due within 3 months of date of purchase | Cost
   
Cash, Cash Equivalents and Marketable Securities    
Cash and cash equivalents 1,500  
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 $ 1,500  
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