Annual report pursuant to Section 13 and 15(d)

Balance Sheer Details - Cash and Investments (Details)

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Balance Sheer Details - Cash and Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Balance Sheet Related Disclosures [Abstract]        
Cash and cash equivalents $ 82,896 $ 67,956 $ 20,696 $ 26,450
Short-term investments, available-for-sale 47,918 43,300    
Long-term investments, available-for-sale 5,991 19,242    
Investments and Cash $ 136,805 $ 130,498