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Commitments - Additional Information (Details)							12 Months Ended
	Oct. 01, 2020 USD ($)	Sep. 22, 2020 ft²	Jul. 27, 2020 USD ($)	Jul. 02, 2020 USD ($)	Jul. 01, 2020 USD ($) ft²	Jun. 25, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Loss Contingencies [Line Items]
Employment agreement, description	Mr. Michel shall also be entitled to: (a) a severance payment equal in the aggregate to twelve (12) months of his annual base salary at the time of termination, payable in twelve (12) equal monthly installments; and (b) specified continuing health plan benefits until the earlier of (i) the twelve (12) month anniversary of his termination date, (ii) the last day he’s eligible for coverage pursuant to COBRA or (iii) the date on which he becomes eligible for similar coverage from another employer.
Lease, description							the 2014 Sublease and 2015 Sublease were extended from May 31, 2020 to August 2, 2021, (ii) effective July 1, 2020, the leased premises under the 2015 Sublease would be expanded to include an additional 4,999 square feet of space, and (iii) effective July 1, 2020, the rent under the 2015 Sublease would increase from approximately $14.6 per month to $20.6 per month.
Extension of sublease					May 31, 2020 to August 2, 2021
Lease term							12 months
Operating or finance lease						$ 0	$ 520,000
Sub lease expiration date		Feb. 28, 2023
Rent expense, net of receipts under the terms of subleases							423,000	$ 529,000
Sublease 2015 [Member]
Loss Contingencies [Line Items]
Additional area of space | ft²					4,999
Increase in sublease rent				$ 20,600,000	$ 14,600,000
2021 Sub-Lease Agreement [Member]
Loss Contingencies [Line Items]
Additional area of space | ft²		6,877
Sublease rent						$ 3,700	405,700
Lease term						5 years
Office Space at 1301 Avenue of the Americas, New York, NY [Member]
Letter of credit
Minimum letter of credit amount required to be maintained under lease agreement							$ 131,000
Expiration date of letter of credit							Feb. 28, 2023
Chief Executive Officer [Member]
Loss Contingencies [Line Items]
Salary and wage, Officer	$ 450,000
Annual target cash bonus, (in percent)	50.00%
Chief Executive Officer [Member] | Maximum [Member]
Loss Contingencies [Line Items]
Reimbursement for travel and stay, per month	$ 6,500
Pending Litigation [Member]
Loss Contingencies [Line Items]
Unpaid compensation amounts claimed			$ 1,140,000
Accrued unpaid compensation amounts							$ 1,140,000

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