Stock-based Compensation	9 Months Ended
Sep. 30, 2022
Share-Based Payment Arrangement [Abstract]
Stock-based Compensation	Stock-Based CompensationThe Company recognized $2.7 million and approximately zero of stock-based compensation expense for the three months ended September 30, 2022, and 2021, respectively. The Company recognized $6.7 million and $0.1 million of stock-based compensation expense for the nine months ended September 30, 2022, and 2021, respectively. As of September 30, 2022, and December 31, 2021, the Company had $35.9 million and $0.2 million of unrecognized share-based compensation expense related to unvested restricted units, respectively, which the Company expects to recognize over a weighted-average period of approximately five years. Legacy Incentive Plans Prior to the Merger, Altus maintained the APAM Holdings LLC Restricted Units Plan, adopted in 2015 (the “APAM Plan”) and APAM Holdings LLC adopted the 2021 Profits Interest Incentive Plan (the “Holdings Plan”, and together with the APAM Plan, the “Legacy Incentive Plans”), which provided for the grant of restricted units that were intended to qualify as profits interests to employees, officers, directors and consultants. In connection with the Merger, vested restricted units previously granted under the Legacy Incentive Plans were exchanged for shares of Class A Common Stock, and unvested Altus Restricted Shares under each of the Legacy Incentive Plans were exchanged for restricted Class A Common Stock with the same vesting conditions. As of September 30, 2022, and December 31, 2021, zero and 446,128 shares of Class A Common Stock were restricted under the APAM Plan, respectively. As of September 30, 2022, and December 31, 2021, 542,511 and 813,759 shares of Class A Common Stock were restricted under the Holdings Plan, respectively. No further awards will be made under the Legacy Incentive Plans. The fair value of the granted units was determined using the Black-Scholes Option Pricing model and relied on assumptions and inputs provided by the Company. All option models utilize the same assumptions with regard to (i) current valuation, (ii) volatility, (iii) risk-free interest rate, and (iv) time to maturity. The models, however, use different assumptions with regard to the strike price which vary by award. Omnibus Incentive Plan On July 12, 2021, the Company entered into the Management Equity Incentive Letter with each of Mr. Felton and Mr. Norell pursuant to which, on February 15, 2022, the Compensation Committee granted to Mr. Felton and Mr. Norell, together with other senior executives, including Anthony Savino, Chief Construction Officer, and Dustin Weber, Chief Financial Officer, restricted stock units (“RSUs”) under the Omnibus Incentive Plan (the "Incentive Plan") that are subject to time-based and, for the named executive officers and certain other executives, eighty percent (80%) of such RSUs also further subject to performance-based vesting, with respect to an aggregate five percent (5%) of the Company’s Class A common stock on a fully diluted basis, excluding the then-outstanding shares of the Company’s Class B common stock or any shares of the Company’s Class A common stock into which such shares of the Company’s Class B common stock are or may be convertible. Subject to continued employment on each applicable vesting date, the time-based RSUs generally vest 33 1/3% on each of the third, fourth and fifth anniversaries of the Closing, and the performance-based RSUs vest with respect to 33 1/3% of the award upon the achievement of the above time-based requirement and the achievement of a hurdle representing a 25% annual compound annual growth rate measured based on an initial value of $10.00 per share. As of September 30, 2022, and December 31, 2021, there were 23,047,325 and 15,364,883 shares of the Company's Class A common stock authorized for issuance under the Incentive Plan, respectively. The number of shares authorized for issuance under the Incentive Plan will increase on January 1 of each year from 2022 to 2031 by the lesser of (i) 5% of the number of shares outstanding as of the close of business on the immediately preceding December 31 and (ii) the number of shares determined by the Company's board of directors. For the three months ended September 30, 2022, the Company granted 155,000 RSUs and recognized $2.7 million of stock compensation expense in relation to the incentive plan. For the nine months ended September 30, 2022, the Company granted 8,043,914 RSUs and recognized $6.7 million of stock-based compensation expense in relation to the Incentive Plan. Employee Stock Purchase Plan On December 9, 2021, we adopted the 2021 Employee Stock Purchase Plan ("ESPP"), which provides a means by which eligible employees may be given an opportunity to purchase shares of the Company’s Class A common stock. As of September 30, 2022, and December 31, 2021, there were 3,072,976 and 1,536,488 shares of the Company's Class A common stock authorized for issuance under the ESPP, respectively. The number of shares authorized for issuance under the ESPP will increase on January 1 of each year from 2022 to 2031 by the lesser of (i) 1% of the number of shares outstanding as of the close of business on the immediately preceding December 31 and (ii) the number of shares determined by the Company's board of directors. No shares of the Company’s Class A common stock were issued and no stock-based compensation expense was recognized in relation to the ESPP for the three and nine months ended September 30, 2022.

Prior to the Merger, Altus maintained the APAM Holdings LLC Restricted Units Plan, adopted in 2015 (the “APAM Plan”) and APAM Holdings LLC adopted the 2021 Profits Interest Incentive Plan (the “Holdings Plan”, and together with the APAM Plan, the “Legacy Incentive Plans”), which provided for the grant of restricted units that were intended to qualify as profits interests to employees, officers, directors and consultants. In connection with the Merger, vested restricted units previously granted under the Legacy Incentive Plans were exchanged for shares of Class A Common Stock, and unvested Altus Restricted Shares under each of the Legacy Incentive Plans were exchanged for restricted Class A Common Stock with the same vesting conditions. As of September 30, 2022, and December 31, 2021, zero and 446,128 shares of Class A Common Stock were restricted under the APAM Plan, respectively. As of September 30, 2022, and December 31, 2021, 542,511 and 813,759 shares of Class A Common Stock were restricted under the Holdings Plan, respectively. No further awards will be made under the Legacy Incentive Plans.

The fair value of the granted units was determined using the Black-Scholes Option Pricing model and relied on assumptions and inputs provided by the Company. All option models utilize the same assumptions with regard to (i) current valuation, (ii) volatility, (iii) risk-free interest rate, and (iv) time to maturity. The models, however, use different assumptions with regard to the strike price which vary by award.

On July 12, 2021, the Company entered into the Management Equity Incentive Letter with each of Mr. Felton and Mr. Norell pursuant to which, on February 15, 2022, the Compensation Committee granted to Mr. Felton and Mr. Norell, together with other senior executives, including Anthony Savino, Chief Construction Officer, and Dustin Weber, Chief Financial Officer, restricted stock units (“RSUs”) under the Omnibus Incentive Plan (the "Incentive Plan") that are subject to time-based and, for the named executive officers and certain other executives, eighty percent (80%) of such RSUs also further subject to performance-based vesting, with respect to an aggregate five percent (5%) of the Company’s Class A common stock on a fully diluted basis, excluding the then-outstanding shares of the Company’s Class B common stock or any shares of the Company’s Class A common stock into which such shares of the Company’s Class B common stock are or may be convertible. Subject to continued employment on each applicable vesting date, the time-based RSUs generally vest 33 1/3% on each of the third, fourth and fifth anniversaries of the Closing, and the performance-based RSUs vest with respect to 33 1/3% of the award upon the achievement of the above time-based requirement and the achievement of a hurdle representing a 25% annual compound annual growth rate measured based on an initial value of $10.00 per share.

As of September 30, 2022, and December 31, 2021, there were 23,047,325 and 15,364,883 shares of the Company's Class A common stock authorized for issuance under the Incentive Plan, respectively. The number of shares authorized for issuance under the Incentive Plan will increase on January 1 of each year from 2022 to 2031 by the lesser of (i) 5% of the number of shares outstanding as of the close of business on the immediately preceding December 31 and (ii) the number of shares determined by the Company's board of directors. For the three months ended September 30, 2022, the Company granted 155,000 RSUs and recognized $2.7 million of stock compensation expense in relation to the incentive plan. For the nine months ended September 30, 2022, the Company granted 8,043,914 RSUs and recognized $6.7 million of stock-based compensation expense in relation to the Incentive Plan.

On December 9, 2021, we adopted the 2021 Employee Stock Purchase Plan ("ESPP"), which provides a means by which eligible employees may be given an opportunity to purchase shares of the Company’s Class A common stock. As of September 30, 2022, and December 31, 2021, there were 3,072,976 and 1,536,488 shares of the Company's Class A common stock authorized for issuance under the ESPP, respectively. The number of shares authorized for issuance under the ESPP will increase on January 1 of each year from 2022 to 2031 by the lesser of (i) 1% of the number of shares outstanding as of the close of business on the immediately preceding December 31 and (ii) the number of shares determined by the Company's board of directors. No shares of the Company’s Class A common stock were issued and no stock-based compensation expense was recognized in relation to the ESPP for the three and nine months ended September 30, 2022.