Restatement - Balance Sheet (Details) - USD ($) $ / shares in Units, $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020
Current assets:
Cash and cash equivalents	$ 23,984		$ 30,312
Short-term investments	37,910		149,057
Accounts receivable, net	23,858		16,602
Contract assets	4,503		4,080
Prepaid expenses	2,409		1,920
Other current assets	1,849		2,085
Total current assets	94,513		204,056
Long-term investments	31,493		48,051
Property and equipment, net	3,938		3,671
Right-of-use assets	6,098		7,056
Intangible assets, net	96,364		28,734
Goodwill	(135,519)		(63,096)
Deferred income tax assets	11,003		10,511
Other non-current assets	5,292		6,310
Total assets	384,220		419,693
Current liabilities:
Accounts payable	6,688		2,507
Accrued payroll and related taxes	8,271		11,776
Contract liabilities (deferred revenue), current	9,700		10,381
Lease liabilities, current portion	1,944		1,943
Acquisition-related contingent consideration	10,790		11,050
Other current liabilities	3,469		1,552
Total current liabilities	40,862		39,209
Convertible senior notes	124,370		120,918
Embedded conversion derivative	0		48,208
Deferred revenue, non-current portion	1,053		955
Lease liabilities, non-current portion	5,485		6,588
Deferred income tax liabilities	20,730		4,117
Other non-current liabilities	6,250		6,868
Total liabilities	198,750		226,863
Stockholders’ equity:
Preferred stock, $0.001 par value, 1,000,000 shares authorized, none issued and outstanding	0		0
Common stock, $0.001 par value, 120,000,000 and 60,000,000 shares authorized, 44,344,361 and 44,168,745 issued and outstanding, as of March 31, 2022 and September 30, 2021, respectively	44		44
Additional paid-in capital	207,491		199,935
Accumulated other comprehensive loss	(5,170)		(943)
Accumulated deficit	(16,895)		(6,066)
Treasury stock, at cost, no shares and 7,773 shares as of March 31, 2022 and September 30, 2021, respectively	0		(140)
Total stockholders’ equity	185,470	$ 187,429	192,830	$ 167,729	$ 141,753	$ 132,243
Total liabilities and stockholders’ equity	$ 384,220		$ 419,693
Preferred stock, par value (in dollars per share)	$ 0.001		$ 0.001
Preferred stock, shares authorized (in shares)	1,000,000		1,000,000
Preferred stock, shares issued (in shares)	0		0
Preferred stock, shares outstanding (in shares)	0		0
Common stock, par value (in dollars per share)	$ 0.001		$ 0.001
Common stock, shares authorized (in shares)	120,000,000		60,000,000
Common stock, shares outstanding (in shares)	44,344,361		44,168,745
Common stock, shares issued (in shares)	44,344,361		44,168,745
Treasury stock, at cost (in shares)	0		7,773
As Previously Reported
Current assets:
Cash and cash equivalents	$ 23,984
Short-term investments	37,910
Accounts receivable, net	23,858
Contract assets	4,503
Prepaid expenses	2,409
Other current assets	1,849
Total current assets	94,513
Long-term investments	31,493
Property and equipment, net	3,938
Right-of-use assets	6,098
Intangible assets, net	96,364
Goodwill	(136,889)
Deferred income tax assets	10,572
Other non-current assets	5,292
Total assets	385,159
Current liabilities:
Accounts payable	5,359
Accrued payroll and related taxes	8,271
Contract liabilities (deferred revenue), current	9,700
Lease liabilities, current portion	1,944
Acquisition-related contingent consideration	10,790
Other current liabilities	3,469
Total current liabilities	39,533
Convertible senior notes	124,370
Deferred revenue, non-current portion	1,053
Lease liabilities, non-current portion	5,485
Deferred income tax liabilities	22,100
Other non-current liabilities	6,250
Total liabilities	198,791
Stockholders’ equity:
Preferred stock, $0.001 par value, 1,000,000 shares authorized, none issued and outstanding	0
Common stock, $0.001 par value, 120,000,000 and 60,000,000 shares authorized, 44,344,361 and 44,168,745 issued and outstanding, as of March 31, 2022 and September 30, 2021, respectively	44
Additional paid-in capital	207,491
Accumulated other comprehensive loss	(5,170)
Accumulated deficit	(15,997)
Treasury stock, at cost, no shares and 7,773 shares as of March 31, 2022 and September 30, 2021, respectively	0
Total stockholders’ equity	186,368
Total liabilities and stockholders’ equity	385,159
Total Adjustments
Current assets:
Cash and cash equivalents	0
Short-term investments	0
Accounts receivable, net	0
Contract assets	0
Prepaid expenses	0
Other current assets	0
Total current assets	0
Long-term investments	0
Property and equipment, net	0
Right-of-use assets	0
Intangible assets, net	0
Goodwill	1,370
Deferred income tax assets	431
Other non-current assets	0
Total assets	(939)
Current liabilities:
Accounts payable	1,329
Accrued payroll and related taxes	0
Contract liabilities (deferred revenue), current	0
Lease liabilities, current portion	0
Acquisition-related contingent consideration	0
Other current liabilities	0
Total current liabilities	1,329
Convertible senior notes	0
Deferred revenue, non-current portion	0
Lease liabilities, non-current portion	0
Deferred income tax liabilities	(1,370)
Other non-current liabilities	0
Total liabilities	(41)
Stockholders’ equity:
Preferred stock, $0.001 par value, 1,000,000 shares authorized, none issued and outstanding	0
Common stock, $0.001 par value, 120,000,000 and 60,000,000 shares authorized, 44,344,361 and 44,168,745 issued and outstanding, as of March 31, 2022 and September 30, 2021, respectively	0
Additional paid-in capital	0
Accumulated other comprehensive loss	0
Accumulated deficit	(898)
Treasury stock, at cost, no shares and 7,773 shares as of March 31, 2022 and September 30, 2021, respectively	0
Total stockholders’ equity	(898)
Total liabilities and stockholders’ equity	$ (939)