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Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2022
Accounting Policies [Abstract]  
Schedule of Restricted Cash Restricted Cash
(in thousands)As of March 31, 2022As of December 31, 2021
Letter of credit security: Waltham lease250 250 
Letter of credit security: Vienna Austria lease212 216 
Letter of credit security: Boston lease855 855 
Restricted cash included in other assets$1,317 $1,321 
Schedule of Reconciliation of Cash, Cash Equivalents, and Restricted Cash
The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the condensed consolidated balance sheets to the sum of the total of amounts shown in the Company’s condensed consolidated statements of cash flows as of March 31, 2022 and December 31, 2021:
 
(in thousands)March 31, 2022December 31, 2021
Cash and cash equivalents$66,427 $81,787 
Restricted cash, non-current1,317 1,321 
Total cash, cash equivalents and restricted cash$67,744 $83,108