Revenue (Tables)

3 Months Ended

Mar. 31, 2018

Revenue from Contract with Customer [Abstract]

Schedule of Cumulative Effect of Changes to Balance Sheet

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	)

Disaggregation of Revenue

The following table presents our revenues disaggregated by product technology:

	Three Months Ended March 31,
	2018	2017 (1)
Air Pollution Control
Technology solutions	7,722	3,348
Spare parts	300	269
Ancillary revenue	561	385
Total Air Pollution Control Technology revenues	8,583	4,002
FUEL CHEM
FUEL CHEM technology solutions	4,208	4,489
Total Revenues	12,791	8,491

(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:

	Three Months Ended March 31,
	2018	2017 (1)
Products transferred at a point in time	5,069	5,143
Products and services transferred over time	7,722	3,348
Total Revenues	12,791	8,491

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

Revenue Disaggregated by Geography

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

	Three Months Ended March 31,
	2018	2017 (1)
United States	10,242	6,734
Foreign Revenues
South America	335	155
Europe	1,454	838
Asia	760	764
Total Foreign Revenues	2,549	1,757
Total Revenues	12,791	8,491

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