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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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- Definition Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition. + References No definition available. + Details
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- Definition Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6578-128477 + Details
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