Fair Value Measurements - Summary of Fair Value Measurement Inputs and Valuation Techniques (Detail)	Dec. 31, 2020 yr	Jul. 15, 2020 yr
Dividend yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants and Rights Outstanding, Measurement Input	0	0
Fair Value, Inputs, Level 3 [Member] \| Exercise price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants and Rights Outstanding, Measurement Input	11.50	11.50
Fair Value, Inputs, Level 3 [Member] \| Stock Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants and Rights Outstanding, Measurement Input	10.00	10.00
Fair Value, Inputs, Level 3 [Member] \| Term (in years)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants and Rights Outstanding, Measurement Input	5.00	5.00
Fair Value, Inputs, Level 3 [Member] \| Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants and Rights Outstanding, Measurement Input	20.00	15.00
Fair Value, Inputs, Level 3 [Member] \| Risk-free interest rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants and Rights Outstanding, Measurement Input	0.85	0.85

PTK Acquisition Corp. 10-K/A