Quarterly report pursuant to Section 13 or 15(d)

Short-term Investments (Details)

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Short-term Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Mar. 31, 2015
Schedule of Investments [Line Items]    
Certificates of deposit $ 5,778 $ 7,912
Held-to-maturity, pre-refunded municipal bonds 10,293 15,994
Total short-term investments $ 16,071 $ 23,906