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Restricted Cash	12 Months Ended
Restricted Cash	Dec. 31, 2018
Restricted Cash
Restricted Cash	5. Restricted Cash At December 31, 2018 and 2017, the Company had an outstanding letter of credit for $0.1 million as a security deposit for its operating lease agreement for office space (Note 9). The Company is required to maintain this deposit for the duration of the lease agreement.