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Related Parties Transactions	3 Months Ended
Related Parties Transactions	Mar. 31, 2020
Related Parties Transactions [Abstract]
Related Parties Transactions	(12) Related Parties The Company is responsible for settling income tax liabilities of certain employees related to stock-based compensation. The Company is then reimbursed for those amounts by the employees. At March 31, 2020 and December 31, 2019, the Company had a liability of $1.2 million representing tax due to the UK tax authorities in respect of an officer of the Company. The Company also included in its balance sheets at March 31, 2020 and December 31, 2019 a current asset of $1.2 million, representing the amount that will be reimbursed to the Company by that officer.