Revenue from Contracts with Customers (Tables)

12 Months Ended

Dec. 31, 2021

Revenue from Contract with Customer [Abstract]

Disaggregation of revenue

The table below presents the Company’s revenue disaggregated by revenue source (in thousands):

	Years Ended December 31,
	2019		2020		2021
Volume-related (1) (2)	$	273,535	$	245,300	$	218,540
Station construction sales		23,120		26,593		16,406
AFTC (3)		47,123		19,831		20,700
Other		287		—		—
Total revenue	$	344,065	$	291,724	$	255,646

(1) Includes changes in fair value of derivative instruments related to the Company’s commodity swap and customer fueling contracts. See Note 1 and Note 7 for more information about these derivative instruments. For the years ended December 31, 2019, 2020 and 2021, changes in the fair value of commodity swaps and customer fueling contracts amounted to a loss of $6.6 million, a gain of $2.1 million, and a loss of $3.5 million, respectively.

(2) Includes non-cash stock-based sales incentive contra-revenue charges associated with the Amazon Warrant for the years ended December 31, 2019, 2020 and 2021 of $0.0 million, $0.0 million and $83.6 million, respectively. See Note 13 for more information.

(3) Represents the federal alternative fuel excise tax credit that we refer to as “AFTC,” which was extended for vehicle fuel sales made beginning January 1, 2021 through December 31, 2021.

Summary of contract balances

As of December 31, 2020 and 2021, the Company’s contract balances were as follows (in thousands):

	2020		2021
Accounts receivable, net	$	61,784	$	87,433
Contract assets - current	$	729	$	966
Contract assets - non-current		3,998		3,532
Contract assets - total	$	4,727	$	4,498
Contract liabilities - current	$	1,638	$	5,523
Contract liabilities - non-current		59		—
Contract liabilities - total	$	1,697	$	5,523