Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2018

The cumulative effect of the changes made to our January 1, 2018 consolidated balance sheet for the adoption of ASC 606 were as follows:



	Balance at December 31, 2017			Adjustments Upon Adoption of ASC 606		Balance at January 1, 2018
Liabilities
Other accrued liabilities	$	5,098		(205	)	$	4,893
Equity
Accumulated deficit	(102,672		)	205		(102,467		)

The following table presents our revenues disaggregated by product technology:



	Twelve Months Ended December 31,
	2018		2017		2016
Air Pollution Control
Technology solutions	$	35,176	$	24,422	$	30,082
Spare parts	1,083		1,022		1,328
Ancillary revenue	2,158		2,364		2,642
Total Air Pollution Control Technology	38,417		27,808		34,052
FUEL CHEM
FUEL CHEM technology solutions	18,118		17,358		21,109
Total Revenues	$	56,535	$	45,166	$	55,161

(1) As noted above, prior period amounts have not been adjusted under the modified retrospective method.

The following table presents the timing of our revenue recognition:



	Twelve Months Ended December 31,
	2018		2017		2016
Products transferred at a point in time	$	21,359	$	20,744	$	25,079
Products and services transferred over time	35,176		24,422		30,082
Total Revenues	$	56,535	$	45,166	$	55,161

(1) As noted above, prior period amounts have not been adjusted under the modified retrospective method.

The following table presents our revenues disaggregated by geography, based on the billing addresses of our customers:



	Twelve Months Ended December 31,
	2018		2017		2016
United States	$	43,887	$	29,510	$	42,545
Foreign Revenues
South America	1,290		2,118		2,934
Europe	6,260		6,206		4,460
Asia	5,098		7,332		5,222
Total Foreign Revenues	12,648		15,656		12,616
Total Revenues	$	56,535	$	45,166	$	55,161

(1) As noted above, prior period amounts have not been adjusted under the modified retrospective method.