Investments

3 Months Ended

Mar. 31, 2019

Investments Debt And Equity Securities [Abstract]

Investments

4. Investments

As of March 31, 2019 and December 31, 2018 the Company had no investments.

The Company had restricted investments of $1,400 as of March 31, 2019 and December 31, 2018 which consisted of a certificate of deposit as a security deposit on its building lease at 200 Sidney Street, Cambridge, Massachusetts.  The cost of restricted investments approximates fair value.