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Basis and Summary of Significant Accounting Policies - Investments (Details)
£ / shares in Units, £ in Millions
1 Months Ended 3 Months Ended
Dec. 05, 2017
£ / shares
Dec. 31, 2017
GBP (£)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2018
GBP (£)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Significant Accounting Policies [Line Items]              
Payment of outstanding note balance | £   £ 2.0          
Proceeds from Investments     $ 666,000 $ 0      
Variable Interest Entity, Not Primary Beneficiary              
Significant Accounting Policies [Line Items]              
Held-to-maturity securities   £ 15.1     £ 14.6 $ 20,500,000 $ 20,400,000
Investment interest rate 12.00%     12.00%      
Asset impairment charges     $ 0        
Perfect Home Warrant              
Significant Accounting Policies [Line Items]              
Issuance of warrant price per share (in GBP per share) | £ / shares £ 0.00001