6. Restricted Cash

At June 30, 2018 and December 31, 2017, the Company had $0.3 million and $0.5 million, respectively, in restricted cash that serves as the security deposit on the lease of the Company’s current facility in Cambridge, Massachusetts (Note 8). In April 2018, the Company collected a $0.2 million refund from its landlord in accordance with the terms of the lease agreement that had previously been classified as restricted cash.

In accordance with the recently adopted accounting pronouncement ASU 2016-18, the following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the condensed consolidated balance sheets that sum to the total of the amounts shown in the condensed consolidated statement of cash flows as of June 30, 2018 and December 31, 2017 and as of June 30, 2017 and December 31, 2016 (in thousands):