Stock-based compensation expense (Tables)

3 Months Ended

Mar. 31, 2017

Stock incentive plan

Summary of stock-based compensation expense recognized by income statement classification

	Three Months Ended
	March 31,
	2017		2016
Processing and service costs	$	42,435	$	48,806
Selling, general and administrative expenses		283,437		555,162
Total stock-based compensation expense	$	325,872	$	603,968

Summary of stock-based compensation expense recognized by type

	Three Months Ended
	March 31,
	2017		2016
Stock options	$	227,506	$	281,396
Restricted stock awards		98,366		322,572
Total stock-based compensation expense	$	325,872	$	603,968