Selected Quarterly Operating Results (Unaudited) - Summary of Selected Quarterly Operating Results (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Revenues:
Total revenues	$ 136,382	$ 137,740	$ 134,256	$ 131,861	$ 134,785	$ 130,867	$ 130,321	$ 133,200	$ 540,239	$ 529,173	$ 531,019
Cost of revenue:
Total cost of revenue	68,339	68,135	65,734	65,231	62,057	61,671	61,118	61,851	267,439	246,697	241,535
Amortization of capitalized software costs and acquired intangible assets	9,259	8,963	8,843	8,413	7,924	7,098	6,924	6,544	35,478	28,490	22,090
Gross profit	68,043	69,605	68,522	66,630	72,728	69,196	69,203	71,349	272,800	282,476	289,484
Operating expenses:
Selling, general and administrative	43,159	42,841	39,046	40,128	44,710	41,304	34,229	44,636	165,174	164,879	193,226
Research and development costs, net	21,429	20,026	19,789	22,051	19,813	20,682	18,371	22,128	83,295	80,994	81,259
Amortization of acquired intangible assets	1,449	964	865	865	1,028	1,027	1,121	1,168	4,143	4,344	7,810
Impairment of assets	8,218	1,948	1,916	489					12,571		3,757
Restructuring costs	77	546	175	1,707	640				2,505	640	611
Total operating expenses	74,332	66,325	61,791	65,240	66,191	63,013	53,721	67,932	267,688	250,857	286,663
Income from operations	(6,289)	3,280	6,731	1,390	6,537	6,183	15,482	3,417	5,112	31,619	2,821
Interest income	111	30	36	79	103	44	40	29	256	216	55
Interest expense	(661)	(435)	(387)	(472)	(595)	(720)	(769)	(730)	(1,955)	(2,814)	(3,323)
Other income (expense), net	632	137	210	(133)	(117)	(227)	237	374	846	267	37
Income before provision for (benefit of) income taxes	(6,207)	3,012	6,590	864	5,928	5,280	14,990	3,090	4,259	29,288	(410)
Provision for (benefit of) income taxes	(1,965)	(1,403)	509	(380)	2,000	456	1,896	442	(3,239)	4,794	(2,830)
Net income	$ (4,242)	$ 4,415	$ 6,081	$ 1,244	$ 3,928	$ 4,824	$ 13,094	$ 2,648	$ 7,498	$ 24,494	$ 2,420
Net income (loss) per share:
Basic	$ (0.06)	$ 0.07	$ 0.09	$ 0.02	$ 0.06	$ 0.07	$ 0.20	$ 0.04	$ 0.11	$ 0.38	$ 0.04
Diluted	$ (0.06)	$ 0.07	$ 0.09	$ 0.02	$ 0.06	$ 0.07	$ 0.20	$ 0.04	$ 0.11	$ 0.38	$ 0.04
Weighted-average shares outstanding:
Basic	65,988	65,493	65,401	65,015	64,749	64,637	64,265	64,019	65,474	64,417	63,435
Diluted	65,988	65,664	65,560	65,353	64,917	64,776	64,857	64,054	65,612	64,600	63,440
Recurring
Revenues:
Total revenues	$ 124,490	$ 124,787	$ 120,589	$ 119,447	$ 120,151	$ 117,446	$ 116,317	$ 120,007	$ 489,313	$ 473,921	$ 476,214
Cost of revenue:
Total cost of revenue	51,992	52,197	50,328	50,540	48,174	47,997	47,172	48,153	205,057	191,496	194,360
Software, Hardware, and Other Non-recurring
Revenues:
Total revenues	11,892	12,953	13,667	12,414	14,634	13,421	14,004	13,193	50,926	55,252	54,805
Cost of revenue:
Total cost of revenue	$ 7,088	$ 6,975	$ 6,563	$ 6,278	$ 5,959	$ 6,576	$ 7,022	$ 7,154	$ 26,904	$ 26,711	$ 25,085