Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

The Company's revenues are derived from Product and related sales and RefrigerantSide® Services revenues. The revenues for each of these lines are as follows:

Years Ended December 31,	2017		2016		2015
(in thousands)
Product and related sales	$	136,016	$	101,344	$	75,154
RefrigerantSide ^® Services		4,364		4,137		4,568
Total	$	140,380	$	105,481	$	79,722

Reconciliation of shares used to determine net income per share

The reconciliation of shares used to determine net income per share is as follows (dollars in thousands):

	Years ended December 31,
	2017		2016		2015

Net income	$	11,157	$	10,637	$	4,763

Weighted average number of shares - basic		41,764,230		34,104,476		32,546,840
Shares underlying warrants		—		—		300,846
Shares underlying options		1,002,613		1,312,434		1,088,413
Weighted average number of shares outstanding – diluted		42,766,843		35,416,910		33,936,099