Business Combination - Additional Information (Detail) - USD ($) $ in Thousands				3 Months Ended	9 Months Ended
	May 23, 2018	May 03, 2018	Oct. 16, 2017	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2017	Apr. 30, 2018	Sep. 30, 2017
Business Acquisition [Line Items]
Acquisition, net of cash acquired					$ 29,744	$ 0
Acquisition-related contingent consideration				$ 2,361	2,361			$ 354
Revenue from business combinations, actual				2,100	4,600
Net loss from business combinations, actual				2,700	3,700
A2iA Group II, S.A.S.
Business Acquisition [Line Items]
Acquisition, net of cash acquired	$ 26,800
Stock issued as consideration	2,514,588
Common stock issued during acquisition, value		$ 21,900
Acquisition consideration, incurred liabilities	$ 200
Business acquisition, transaction costs	2,000
Payments of cash for collateral	$ 700
Payments for collateral, equity, shares	508,479
Payments for collateral, equity, value	$ 4,400
ICAR Vision Systems, S.L.
Business Acquisition [Line Items]
Acquisition, net of cash acquired			$ 3,000
Stock issued as consideration			584,291
Common stock issued during acquisition, value			$ 5,600
Business acquisition, transaction costs			500
Acquisition-related contingent consideration			2,900
Contingent consideration, change in amount of contingent consideration liability				$ 300	$ 1,000
Escrow deposit			1,500				$ 1,500
ICAR Vision Systems, S.L. | Contingent Consideration, Fourth Quarter Consideration
Business Acquisition [Line Items]
Contingent consideration arrangement, range of outcomes, high			1,500
ICAR Vision Systems, S.L. | Contingent Consideration, Earnout Consideration
Business Acquisition [Line Items]
Contingent consideration arrangement, range of outcomes, high			$ 3,800