Investment in TheBit Daily LLC (Details Narrative) $ in Thousands	Mar. 23, 2018 USD ($)
Cryptocurrency of subscription price	$ 25
TheBit Daily LLC [Member]
Limited liability of interests	8.00%

Represents the cryptocurrency of subscription price.

No definition available.

Name:	spex_CryptocurrencyOfSubscriptionPrice
Namespace Prefix:	spex_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration