Quarterly report pursuant to Section 13 or 15(d)

Lease Agreements (Details)

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Lease Agreements (Details)
$ in Millions
6 Months Ended
Jun. 30, 2018
USD ($)
item
Jul. 31, 2017
ft²
Dec. 31, 2014
ft²
Sublease Agreement      
Number of lease renewal periods | item 2    
Lease renewal term (in years) 5 years    
Area of real estate property (square feet) | ft²   9,328 57,000
Expected income from sublease | $ $ 20.2