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Restricted Cash	12 Months Ended
	Dec. 31, 2017
Restricted Cash
Restricted Cash	5. Restricted Cash         At December 31, 2017 and 2016, 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.

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The entire disclosure for restricted cash balances, which may include deposits, applicable carrying amounts, restricted amounts and compensating balance arrangements.

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