Short-term Investments (Tables)
|9 Months Ended|
Sep. 30, 2018
|Investments Debt And Equity Securities [Abstract]|
The following table summarizes the held-to-maturity securities held at September 30, 2018 and December 31, 2017 (in thousands):
Tabular disclosure of information about investment in debt security measured at amortized cost (held-to-maturity).
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef