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Defined Contribution Benefit Plan	12 Months Ended
Defined Contribution Benefit Plan	Dec. 31, 2018
Postemployment Benefits [Abstract]
Defined Contribution Benefit Plan	Defined Contribution Benefit Plan The Company sponsors a 401(k) retirement plan, in which substantially all of its full-time U.S. employees are eligible to participate. Participants may contribute a percentage of their annual compensation to this plan, subject to statutory limitations. The Company made matching contributions of $18,000 and $19,000 to this plan during the years ended December 31, 2018 and 2017, respectively. The Company did not provide any contributions to this plan during the year ended December 31, 2016. Through 2016, Viventia sponsored a 401(k) retirement plan for its U.S.-based employees. Participants contributed a percentage of their annual compensation to this plan, subject to statutory limitations. The Company made matching contributions of $8,000 for the period from the Acquisition Date through December 31, 2016 to this plan. Viventia did not have any U.S.-based employees in 2017 or 2018. The Company maintains a defined contribution plan for its Canadian employees. Participants may contribute a percentage of their annual compensation to this plan, subject to statutory limitations. The Company contributes up to the first 4% of eligible compensation for its Canadian-based employees to the retirement plan. The Company made contributions of $45,000 and $64,000 for the years ended December 31, 2018 and 2017, respectively, and $14,000 for the period from the Acquisition Date through December 31, 2016 to this plan.