Related Party Transactions - (Detail) - USD ($) $ in Thousands |
9 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2021 |
Sep. 30, 2020 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|
| Related Party Transaction [Line Items] | ||||
| Long-term Debt, Gross | $ 81,237 | $ 103,435 | $ 123,044 | |
| Seahawk LSA [Member] | Blacksky Technology [Member] | ||||
| Related Party Transaction [Line Items] | ||||
| Nature of Common Ownership or Management Control Relationships | Debt Issuer | Debt Issuer | ||
| Related Party Transaction, Description of Transaction | In 2019, the Company raised and converted $18.4 million from prior debt into new, outstanding debt and issued 13.5 million warrants to purchase Legacy BlackSky common stock. | In 2019, the Company raised and converted $18.4 million from the Seahawk LSA into the Intelsat Facility as outstanding debt and issued 13.5 million warrants to purchase common stock. | ||
| Long-term Debt, Gross | $ 19,198 | $ 19,198 | 18,446 | |
| Intelsat [Member] | Blacksky Technology [Member] | ||||
| Related Party Transaction [Line Items] | ||||
| Nature of Common Ownership or Management Control Relationships | Debt Issuer | Debt Issuer | ||
| Related Party Transaction, Description of Transaction | In 2019, the Company entered into a term loan facility for $50.0 million and issued 20.2 million warrants to purchase Legacy BlackSky common stock. | In 2019, the Company entered into a term loan facility with Intelsat Facility for $50.0 million and issued 20.2 million warrants to purchase common stock. | ||
| Long-term Debt, Gross | $ 52,039 | $ 52,039 | 50,000 | |
| Jason And Marian Joh Andrews [Member] | Blacksky Technology [Member] | ||||
| Related Party Transaction [Line Items] | ||||
| Nature of Common Ownership or Management Control Relationships | The former co-founders and employees of Legacy BlackSky | The Former Co-founders and employees of BlackSky | ||
| Related Party Transaction, Description of Transaction | In 2018, the Company executed the notes totaling $12.5 million to repurchase an aggregate 11.5 million of Legacy BlackSky common stock shares. | In 2018, the Company executed the Andrew’s Notes worth $12.5 million in total to repurchase an aggregate 11.5 million of common stock shares, which were not exchanged for Osprey shares at the time of the merger. | ||
| Long-term Debt, Gross | $ 10,000 | $ 12,500 | 12,500 | |
| LeoStella [Member] | Blacksky Technology [Member] | ||||
| Related Party Transaction [Line Items] | ||||
| Nature of Common Ownership or Management Control Relationships | Joint Venture | Joint Venture | ||
| Related Party Transaction, Description of Transaction | Design, development and manufacture of multiple satellites | In 2018, the Company formed LeoStella and, pursuant to the terms and conditions of the joint venture agreement, the Company has two designated members of LeoStella’s Board of Directors. As described in Note 6, the Company and LeoStella executed an SPC to design, develop and manufacture multiple satellites for the Company’s geospatial business operations. | ||
| Repayments of Related Party Debt | $ 15,060 | $ 8,205 | $ 8,205 | 23,315 |
| Due to Related Parties | $ 0 | 8,012 | 11,460 | |
| Palantir Technologies [Member] | Blacksky Technology [Member] | ||||
| Related Party Transaction [Line Items] | ||||
| Nature of Common Ownership or Management Control Relationships | Strategic Partner | |||
| Related Party Transaction, Description of Transaction | Multi-year software subscription agreement for $8.0 million | |||
| Repayments of Related Party Debt | $ 375 | $ 0 | ||
| Due to Related Parties | $ 0 | $ 0 | ||
| X-Bow [Member] | Blacksky Technology [Member] | ||||
| Related Party Transaction [Line Items] | ||||
| Nature of Common Ownership or Management Control Relationships | Equity Method Investee | Equity Method Investee | ||
| Related Party Transaction, Description of Transaction | In 2017, the Company received stock in X-Bow. As of September 30, 2021, the Company had a 17.9% investment in X-Bow and had one Board seat. As described in Note 7, the Company has engaged X-Bow to develop a rocket for the Company. | In 2017, the Company entered into a Stock Subscription and Technology Transfer Agreement with X-Bow. As of December 31, 2020, the Company has a 20.6% interest in X-Bow and has one Board seat. As described in Note 6, the Company has engaged X-Bow to develop a rocket for the Company. | ||
| Repayments of Related Party Debt | $ 1,865 | $ 3,079 | $ 4,079 | $ 114 |
| Due to Related Parties | $ 0 | $ 750 | ||