Quarterly report pursuant to Section 13 or 15(d)

Balance Sheer Details - Cash and Investments (Details)

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Balance Sheer Details - Cash and Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2013
Balance Sheet Related Disclosures [Abstract]        
Cash and cash equivalents $ 56,731 $ 20,696 $ 31,248 $ 26,450
Short-term investments, available-for-sale 16,638 48,399    
Long-term investments, available-for-sale 8,706 10,256    
Investments and Cash $ 82,075 $ 79,351