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Business Combinations - Additional Information (Details) - USD ($) $ in Thousands					1 Months Ended	3 Months Ended
	May 23, 2018	May 03, 2018	Apr. 30, 2018	Oct. 16, 2017	Jan. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2018
Business Acquisition [Line Items]
Payment to acquired business, net of cash acquired						$ 0	$ 2,991
Acquisition-related contingent consideration						$ 3,007		$ 3,051
A2iA
Business Acquisition [Line Items]
Payment to acquired business, net of cash acquired	$ 26,800
Stock issued during acquisition (in shares)	2,514,588
Common stock issued during acquisition, value		$ 21,900
Transaction-related liabilities	$ 200
Business acquisition, transaction costs	2,200
Payments of cash for collateral	$ 700
Payments for collateral, equity, shares	508,479
Payments for collateral, equity, value	$ 4,400
Period to maintain escrow deposit	24 months
ICAR
Business Acquisition [Line Items]
Payment to acquired business, net of cash acquired				$ 3,000
Stock issued during acquisition (in shares)				584,291
Common stock issued during acquisition, value				$ 5,600
Business acquisition, transaction costs				500
Period to maintain escrow deposit			24 months
Acquisition-related contingent consideration				2,900
Escrow deposit			$ 1,500	1,500
ICAR | Q4 Consideration
Business Acquisition [Line Items]
Contingent consideration arrangement, range of outcomes, high				1,500
ICAR | Earnout Consideration
Business Acquisition [Line Items]
Contingent consideration arrangement, range of outcomes, high				$ 3,800
ICAR | Earnout Consideration | Subsequent Event
Business Acquisition [Line Items]
Payment of earnout contingent consideration					$ 1,800

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Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

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Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

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Amount of liability recognized arising from contingent consideration in a business combination.

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