Quarterly report pursuant to Section 13 or 15(d)

Balance Sheet Details - Cash and Investments (Details 1)

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Balance Sheet Details - Cash and Investments (Details 1) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Balance Sheet Related Disclosures [Abstract]        
Cash and cash equivalents $ 55,645 $ 71,872    
Short-term restricted cash 617 1,476    
Long-term restricted cash 1,071 1,064    
Cash, cash equivalents and restricted cash $ 57,333 $ 74,412 $ 91,238 $ 82,896