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Related Party Transactions (Details)				1 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended
	Jul. 31, 2017 USD ($)	May 26, 2017 USD ($) ft²	Oct. 13, 2016 shares	May 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Nov. 16, 2016 $ / shares	Jan. 09, 2013 ft²
Member of Board of Directors
Related Party Transaction [Line Items]
Legal fees					$ 400,000			$ 1,500,000	$ 602,000
Accounts payable to related party					$ 35,000		$ 35,000
MacAndrews & Forbes
Related Party Transaction [Line Items]
Area of real estate property (in sq ft) | ft²											6,676
Rent expense, sublease rentals, net	$ 2,000,000
Rent expense, sublease rentals, estimate	2,400,000
Private Placement
Related Party Transaction [Line Items]
Payments of stock issuance costs						$ 1,764,240	1,764,240
Share price | $ / shares										$ 2.49
Common Stock | Private Placement
Related Party Transaction [Line Items]
Stock issued during period, shares, new issues | shares			708,530
Common Stock | Private Placement | MacAndrews & Forbes
Related Party Transaction [Line Items]
Stock issued during period, shares, new issues | shares			565,000
New HQ Lease | MacAndrews & Forbes
Related Party Transaction [Line Items]
Area of real estate property (in sq ft) | ft²		3,200
Monthly rental payments for initial period		$ 25,333
Monthly rental payments after initial period		29,333
Additional facility fee		$ 3,333
Facility fee annual increase, percent				5.00%
Facility fee after initial period				$ 0
Replacement M&F Sublease | MacAndrews & Forbes
Related Party Transaction [Line Items]
Monthly rental payments for initial period	36,996
Monthly rental payments after initial period	$ 37,831
Free rent period	2 months
Initial rent period	12 months
Monthly rental payments after secondary period	$ 38,665
Rent expense, sublease rentals	900,000
Old HQ Sublease
Related Party Transaction [Line Items]
Business exit costs						$ 1,100,000
Lease termination liability							$ 100,000
Old HQ Sublease | MacAndrews & Forbes
Related Party Transaction [Line Items]
Monthly rental payments for initial period	60,000
Monthly rental payments after initial period	63,400
Rent discrepancy, sublease rentals	$ 1,100,000

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