Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
License revenue	$ 45,867	$ 44,007
Service revenue	10,816	8,458
Total revenue	56,683	52,465
Cost of revenue-license	9,612	6,804
Cost of revenue-service	2,824	1,974
Cost of revenue-amortization of acquired technology	864	878
Total cost of revenue	13,300	9,656
Gross profit	43,383	42,809
Operating expenses:
Marketing and selling	20,065	21,242
Research and development	9,442	9,554
General and administrative	15,690	10,927
Amortization of other intangible assets	1,024	1,011
Total operating expenses	46,221	42,734
(Loss) income from operations	(2,838)	75
Other (income) expense:
Interest expense	852	758
Interest income	(124)	(127)
(Gain) loss on foreign exchange	(34)	560
Loss on derivatives	136	54
Other	(4)	6
Total other expense, net	826	1,251
Loss before benefit from income taxes	(3,664)	(1,176)
Benefit from income taxes	(2,465)	(101)
Net loss	(1,199)	(1,075)
Net loss available to common stockholders-basic and diluted	$ (1,199)	$ (1,075)
Net loss per common share-basic and diluted	$ (0.03)	$ (0.03)
Weighted-average number of shares outstanding-basic and diluted	40,005,789	39,476,439
Dividends declared per common share	$ 0.116	$ 0.113