Quarterly report pursuant to Section 13 or 15(d)

Cash Equivalents and Investments (Narrative) (Details)

v3.19.1
Cash Equivalents and Investments (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash Equivalents and Investments [Abstract]    
Gross unrealized losses $ 0  
Gross realized gains (losses) $ 0 $ 0