Significant Accounting Policies - Mezzanine Equity (Details) - Legacy Solid Power |
12 Months Ended |
|---|---|
|
Dec. 31, 2021
shares
| |
| Temporary Equity [Line Items] | |
| Conversion ratio | 1 |
| Series A1 Preferred Stock | |
| Temporary Equity [Line Items] | |
| Number of shares converted into common stock | 14,069,187 |
| Series B Preferred Stock | |
| Temporary Equity [Line Items] | |
| Number of shares converted into common stock | 8,777,812 |