Restatement of Previously Reported Unaudited Interim Consolidated Financial Statements (Unaudited) - Schedule of Cashflows (Details) - USD ($) $ in Thousands	3 Months Ended								6 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2022	Jun. 30, 2022	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Operating activities:
Net income	$ (311)	$ (215)	$ 435	$ 3,123	$ 1,807	$ 2,985	$ 1,019	$ 2,167	$ 3,559	$ 3,344	$ 3,032	$ 7,978	$ 7,814
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation expense									6,429	10,117	13,346	11,532	9,551
Amortization of intangible assets									4,525	9,176	13,547	7,505	6,439
Depreciation and amortization									555	1,064	1,401	1,439	1,504
Amortization of investment premiums & other									1,109	1,348	1,684	1,266	63
Accretion and amortization on debt securities									3,453	5,239	7,053	4,372	0
Net changes in estimated fair value of acquisition-related contingent consideration									(1,370)	(1,278)	(1,358)	1,080	136
Deferred taxes									(763)	(1,705)	(3,893)	105	1,903
Changes in assets and liabilities, net of acquisitions:
Accounts receivable									(6,095)	(12,233)	(10,813)	(813)	(361)
Contract assets									345	(1,737)	(2,330)	1,150	(6,695)
Other assets									450	(848)	363	(1,331)	173
Accounts payable									3,769	1,147	2,183	(1,589)	277
Accrued payroll and related taxes									(4,693)	(2,643)	(2,195)	2,687	2,343
Deferred revenue									(2,215)	1,917	1,850	1,790	3,141
Restructuring accrual										1,900	991	0	(1,562)
Other liabilities									628	1,205	1,490	170	(604)
Net cash provided by operating activities									9,686	16,013	26,351	37,341	24,122
Investing activities:
Purchases of investments									(47,818)	(47,818)	(47,818)	(246,508)	(44,725)
Sales and maturities of investments									173,316	173,198	173,316	89,956	20,822
Acquisitions, net of cash acquired									(126,607)	(126,607)	(127,902)	(12,549)	0
Purchases of property and equipment									(634)	(929)	(1,126)	(1,387)	(803)
Net cash used in investing activities									(1,743)	(2,156)	(3,530)	(170,488)	(24,706)
Financing activities:
Proceeds from the issuance of equity plan common stock									1,128	1,162	1,725	4,035	4,809
Repurchases and retirements of common stock									(14,828)	(14,828)	(15,176)	(190)	(1,002)
Payment of acquisition-related contingent consideration										(6,770)	(7,656)	(782)	(478)
Loans made to non-executive employees										(1,041)
Principal payments on other borrowings									(36)	(36)	(36)	(88)	(143)
Net cash provided by (used in) financing activities									(13,736)	(21,513)	(21,143)	143,680	3,403
Foreign currency effect on cash and cash equivalents									(535)	(1,113)	69	(207)	419
Net increase in cash and cash equivalents									(6,328)	(8,769)	1,747	10,326	3,238
Cash and cash equivalents at beginning of period	21,543	23,984		30,312				$ 19,986	30,312	30,312	30,312	19,986	16,748
Cash and cash equivalents at end of period	32,059	21,543	23,984		30,312				23,984	21,543	32,059	30,312	19,986
Supplemental disclosures of cash flow information:
Issuance of common stock for acquisition-related contingent consideration										2,722
Cash paid for interest									582	597	1,164	569	0
Cash paid for income taxes									597	819	750	741	(451)
Supplemental disclosures of non-cash investing and financing activities:
Reclassification of convertible senior notes hedge and embedded conversion derivative to additional paid-in capital									42,821	42,821	28,516	0	0
Unrealized gain (loss) on investments		909	(828)						(1,098)	(189)	283	(165)	$ 103
As Previously Reported
Operating activities:
Net income		811	1,013						4,137	4,948
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation expense									6,429	10,117
Amortization of intangible assets									4,525	9,176
Depreciation and amortization									555	1,064
Amortization of investment premiums & other									1,109	1,348
Accretion and amortization on debt securities									3,453	5,239
Net changes in estimated fair value of acquisition-related contingent consideration									(780)	(2,198)
Deferred taxes									(523)	(1,141)
Changes in assets and liabilities, net of acquisitions:
Accounts receivable									(6,171)	(12,298)
Contract assets									345	(1,737)
Other assets									498	(1,090)
Accounts payable									3,769	1,147
Accrued payroll and related taxes									(4,693)	(2,643)
Deferred revenue									(3,126)	1,077
Restructuring accrual										1,900
Other liabilities									159	1,104
Net cash provided by operating activities									9,686	16,013
Investing activities:
Purchases of investments									(47,818)	(47,818)
Sales and maturities of investments									173,316	173,198
Acquisitions, net of cash acquired									(126,607)	(126,607)
Purchases of property and equipment									(634)	(929)
Net cash used in investing activities									(1,743)	(2,156)
Financing activities:
Proceeds from the issuance of equity plan common stock									1,128	1,162
Repurchases and retirements of common stock									(14,828)	(14,828)
Payment of acquisition-related contingent consideration										(6,770)
Loans made to non-executive employees										(1,041)
Principal payments on other borrowings									(36)	(36)
Net cash provided by (used in) financing activities									(13,736)	(21,513)
Foreign currency effect on cash and cash equivalents									(535)	(1,113)
Net increase in cash and cash equivalents									(6,328)	(8,769)
Cash and cash equivalents at beginning of period	21,543	23,984		30,312					30,312	30,312	30,312
Cash and cash equivalents at end of period		21,543	23,984		30,312				23,984	21,543		30,312
Supplemental disclosures of cash flow information:
Issuance of common stock for acquisition-related contingent consideration										2,722
Cash paid for interest									582	597
Cash paid for income taxes									597	819
Supplemental disclosures of non-cash investing and financing activities:
Reclassification of convertible senior notes hedge and embedded conversion derivative to additional paid-in capital									42,821	42,821
Unrealized gain (loss) on investments		909	(828)						(1,098)	(189)
Total Adjustments
Operating activities:
Net income		(1,026)	(578)						(578)	(1,604)
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation expense									0	0
Amortization of intangible assets									0	0
Depreciation and amortization									0	0
Amortization of investment premiums & other									0	0
Accretion and amortization on debt securities									0	0
Net changes in estimated fair value of acquisition-related contingent consideration									(590)	920
Deferred taxes									(240)	(564)
Changes in assets and liabilities, net of acquisitions:
Accounts receivable									76	65
Contract assets									0	0
Other assets									(48)	242
Accounts payable									0	0
Accrued payroll and related taxes									0	0
Deferred revenue									911	840
Restructuring accrual										0
Other liabilities									469	101
Net cash provided by operating activities									0	0
Investing activities:
Purchases of investments									0	0
Sales and maturities of investments									0	0
Acquisitions, net of cash acquired									0	0
Purchases of property and equipment									0	0
Net cash used in investing activities									0	0
Financing activities:
Proceeds from the issuance of equity plan common stock									0	0
Repurchases and retirements of common stock									0	0
Payment of acquisition-related contingent consideration										0
Loans made to non-executive employees										0
Principal payments on other borrowings									0	0
Net cash provided by (used in) financing activities									0	0
Foreign currency effect on cash and cash equivalents									0	0
Net increase in cash and cash equivalents									0	0
Cash and cash equivalents at beginning of period	$ 0	0		$ 0					0	0	$ 0
Cash and cash equivalents at end of period		0	0		$ 0				0	0		$ 0
Supplemental disclosures of cash flow information:
Issuance of common stock for acquisition-related contingent consideration										0
Cash paid for interest									0	0
Cash paid for income taxes									0	0
Supplemental disclosures of non-cash investing and financing activities:
Reclassification of convertible senior notes hedge and embedded conversion derivative to additional paid-in capital									0	0
Unrealized gain (loss) on investments		$ 0	$ 0						$ 0	$ 0