Quarterly report pursuant to Section 13 or 15(d)

Fair value measurements (Details)

v3.7.0.1
Fair value measurements (Details)
$ in Thousands
Jun. 30, 2017
USD ($)
Marketable securities:  
Marketable securities - available for sale debt securities $ 80,023
Money market funds  
Cash equivalents:  
Money market funds 17,979
Corporate debt securities  
Cash equivalents:  
Corporate debt securities 2,051
Level 1 | Money market funds  
Cash equivalents:  
Money market funds 17,979
Level 1 | Corporate debt securities  
Cash equivalents:  
Corporate debt securities 2,051
Recurring basis | Corporate debt securities  
Marketable securities:  
Marketable securities - available for sale debt securities 80,023
Recurring basis | Level 1 | Corporate debt securities  
Marketable securities:  
Marketable securities - available for sale debt securities $ 80,023