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, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Balance Sheet Related Disclosures [Abstract]        
Cash, cash equivalents and restricted cash $ 74,412 $ 82,896 $ 67,956 $ 20,696
Cash and cash equivalents 71,872 81,086    
Short-term investments, available-for-sale 0 47,918    
Long-term investments, available-for-sale 0 5,991    
Investments and Cash 74,412 136,805    
Restricted Cash and Cash Equivalents, Current 1,476 614    
Restricted Cash and Cash Equivalents, Noncurrent $ 1,064 $ 1,196