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Related Party Transactions (Details)		1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	May 26, 2017 USD ($) ft²	May 31, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Jan. 09, 2013 ft²
Member of Board of Directors
Related Party Transaction [Line Items]
Legal fees			$ 112,500	$ 139,000	$ 220,000	$ 217,000
Accounts payable to related party			75,000		75,000
MacAndrews & Forbes
Related Party Transaction [Line Items]
Area of real estate property (in sq ft) | ft²								6,676
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		$ 4,925
Old HQ Subleas
Related Party Transaction [Line Items]
Business exit cost							$ 1,100,000
Write down of leasehold improvements and furniture							$ 100,000
Other Liabilities
Related Party Transaction [Line Items]
Lease termination liability			$ 300,000		$ 300,000

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