| Income Taxes - Summary of Operating Loss Carryforwards (Details) $ in Thousands | Jun. 30, 2021  USD ($) | 
|---|---|
| U.S. Federal | AdColony | |
| Operating Loss Carryforwards [Line Items] | |
| Operating loss carryforwards, subject to expiration | $ 60,924 | 
| Operating loss carryforwards, not subject to expiration | 47,704 | 
| State taxing jurisdictions | AdColony | |
| Operating Loss Carryforwards [Line Items] | |
| Operating loss carryforwards, subject to expiration | 129,685 | 
| Foreign tax authority | Fyber | Germany | |
| Operating Loss Carryforwards [Line Items] | |
| Operating loss carryforwards, not subject to expiration | 90,203 | 
| Foreign tax authority | Fyber | Israel | |
| Operating Loss Carryforwards [Line Items] | |
| Operating loss carryforwards, not subject to expiration | $ 17,885 | 
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