Revenue (Tables)

6 Months Ended

Jun. 30, 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	(102,503	)	205		(102,298	)

The following table presents the timing of our revenue recognition:



	Three Months Ended June 30,		Six Months Ended June 30,
	2018	2017 (1)	2018	2017 (1)
Products transferred at a point in time	4,255	4,987	9,324	10,130
Products and services transferred over time	7,592	4,754	15,314	8,102
Total Revenues	11,847	9,741	24,638	18,232

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

The following table presents our revenues disaggregated by product technology:



	Three Months Ended June 30,		Six Months Ended June 30,
	2018	2017 (1)	2018	2017 (1)
Air Pollution Control
Technology solutions	7,592	4,754	15,314	8,102
Spare parts	229	267	529	536
Ancillary revenue	586	524	1,147	909
Total Air Pollution Control Technology revenues	8,407	5,545	16,990	9,547
FUEL CHEM
FUEL CHEM technology solutions	3,440	4,196	7,648	8,685
Total Revenues	11,847	9,741	24,638	18,232

(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:

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