Quarterly report pursuant to Section 13 or 15(d)

Cash Equivalents and Marketable Securities (Details)

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Cash Equivalents and Marketable Securities (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
USD ($)
item
Dec. 31, 2016
USD ($)
Cash Equivalents and Marketable Securities    
Marketable Securities, Unrealized Losses $ (13) $ (9)
Total, Amortized Cost 70,507 83,602
Total, Fair Value 70,494 83,593
Realized gains (losses) $ 0  
Number of investments adjusted for other-than-temporary declines in fair value | item 0  
Unrealized Loss Position    
Number of securities in unrealized loss position for less than twelve months | item 9  
Fair value of securities held by Company in an unrealized loss position for less than twelve months $ 22,500  
Number of securities in unrealized loss position for more than twelve months | item 0  
Money market funds    
Cash Equivalents and Marketable Securities    
Cash Equivalents, Amortized Cost $ 31,001 58,588
Cash Equivalents, Fair value 31,001 58,588
Government agency obligations    
Cash Equivalents and Marketable Securities    
Cash Equivalents, Amortized Cost 1,998  
Cash Equivalents, Fair value 1,998  
Overnight repurchase agreements    
Cash Equivalents and Marketable Securities    
Cash Equivalents, Amortized Cost 15,000  
Cash Equivalents, Fair value 15,000  
U.S treasury obligations    
Cash Equivalents and Marketable Securities    
Marketable Securities, Amortized Cost 22,508 25,014
Marketable Securities, Unrealized Losses (13) (9)
Marketable Securities, Fair Value $ 22,495 $ 25,005