Revenue (Tables)

9 Months Ended

Sep. 30, 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   September 30,				Nine Months Ended   September 30,
	2018		2017 (1)		2018		2017 (1)
Air Pollution Control
Technology solutions	$	10,202	$	7,365	$	25,516	$	15,466
Spare parts	334		312		863		848
Ancillary revenue	346		1,122		1,493		2,032
Total Air Pollution Control Technology revenues	10,882		8,799		27,872		18,346
FUEL CHEM
FUEL CHEM technology solutions	5,188		4,749		12,836		13,434
Total Revenues	$	16,070	$	13,548	$	40,708	$	31,780

(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   September 30,		Nine Months Ended   September 30,
	2018	2017 (1)	2018	2017 (1)
Products transferred at a point in time	5,868	6,183	15,192	16,314
Products and services transferred over time	10,202	7,365	25,516	15,466
Total Revenues	16,070	13,548	40,708	31,780

(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   September 30,				Nine Months Ended   September 30,
	2018		2017 (1)		2018		2017 (1)
United States	$	11,629	$	8,888	$	30,701	$	21,537
Foreign Revenues
South America	278		35		904		260
Europe	1,907		2,532		4,935		4,513
Asia	2,256		2,093		4,168		5,470
Total Foreign Revenues	4,441		4,660		10,007		10,243
Total Revenues	$	16,070	$	13,548	$	40,708	$	31,780

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