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