|12 Months Ended|
Dec. 31, 2017
|Marketable Securities [Abstract]|
3. Marketable Securities
The following table shows the Company’s marketable securities’ adjusted cost, gross unrealized gains and losses, and fair value by significant investment category as of December 31, 2017 and 2016:
The Company typically invests in highly-rated securities, with the primary objective of minimizing the potential risk of principal loss. As of December 31, 2017, the Company had three investments of commercial paper with a fair value of $3,238,500 and unrealized losses of $2,505, and 15 corporate bonds with a fair value of $14,693,441 and unrealized losses of $54,381, all of which have been unrealized losses for less than 12 months. The Company does not intend to sell its marketable securities in an unrealized loss position. Based upon the Company’s securities’ fair value relative to the cost, high ratings, and volatility of fair value, the Company considers the declines in market value of its marketable securities to be temporary in nature and does not consider any of its investments other-than-temporarily impaired, and anticipates that it will recover the entire amortized cost basis.
The amortized cost basis and fair value of marketable securities by contractual maturity are:
The entire disclosure for investments in certain debt and equity securities.
Reference 1: http://www.xbrl.org/2003/role/presentationRef