Security Deposits - Schedule of Security Deposits Consisted (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Office lease security deposit	$ 922	$ 922
Other deposits	1,100	90
Total security deposits	11,362	10,352
Luminant Power Purchase Agreement Independent
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Collateral amount	6,277	6,277
Luminant Purchase and Sale Agreement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Collateral amount	$ 3,063	$ 3,063