Annual report pursuant to Section 13 and 15(d)

Balance Sheet Details - Cash and Investments (Details)

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Balance Sheet Details - Cash and Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Balance Sheet Related Disclosures [Abstract]        
Money Market Funds, at Carrying Value $ 20,400 $ 0    
Cash and cash equivalents 92,708 73,142    
Short-term restricted cash 349 645    
Long-term restricted cash 60 404    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 93,117 74,191 $ 74,412 $ 82,896
Restricted Cash and Cash Equivalents $ 400 $ 1,000