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Business Combinations - Additional Information (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended | 28 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 16, 2017 | Jan. 31, 2019 | Mar. 31, 2021 | Mar. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2020 | Dec. 31, 2019 | Apr. 30, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Consideration paid for acquisition, net of cash acquired |  |  |  |  | $ 0 | $ 0 | $ 29,744,000 |  |  |
Acquisition-related costs and expenses |  |  |  |  | 6,575,000 | 7,563,000 | 8,239,000 |  |  |
Earnout consideration liability |  |  |  |  | 753,000 | 1,601,000 |  | $ 753,000 |  |
Payment for contingent consideration liability |  |  |  |  | 478,000 | $ 1,030,000 | 1,284,000 |  |  |
Revenue from business combinations |  |  |  |  |  |  | 9,100,000 |  |  |
Net loss from business combinations |  |  |  |  |  |  | 5,300,000 |  |  |
A2iA |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Consideration paid for acquisition, net of cash acquired |  |  |  |  |  |  |  | $ 26,800,000 |  |
Acquisition-related shares issued (in shares) |  |  |  |  |  |  |  | 2,514,588 |  |
Value of common stock issued during acquisition |  |  |  |  |  |  |  | $ 21,900,000 |  |
Transaction-related liabilities |  |  |  |  |  |  |  | 200,000 |  |
Acquisition-related costs and expenses |  |  |  |  |  |  | $ 2,200,000 |  |  |
Payments for cash for collateral |  |  |  |  |  |  |  | $ 700,000 |  |
Payments for collateral, equity (in shares) |  |  |  |  |  |  |  | 508,479 |  |
Payments for collateral, equity, value |  |  |  |  |  |  |  | $ 4,400,000 |  |
Period to maintain escrow funds |  |  |  |  |  |  |  | 24 months |  |
Claims against the escrow funds |  |  |  |  |  |  |  | $ 0 |  |
ICAR |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Consideration paid for acquisition, net of cash acquired | $ 3,000,000.0 |  |  |  |  |  |  |  |  |
Acquisition-related shares issued (in shares) | 584,291 |  |  |  |  |  |  |  |  |
Value of common stock issued during acquisition | $ 5,600,000 |  |  |  |  |  |  |  |  |
Earnout consideration liability | 2,900,000 |  |  |  |  |  |  |  |  |
Acquisition transaction costs | 500,000 |  |  |  |  |  |  |  |  |
Escrow deposit | 1,500,000 |  |  |  |  |  |  |  | $ 1,000,000.0 | $ 1,500,000
ICAR | Q4 Consideration |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum earnout consideration | 1,500,000 |  |  |  |  |  |  |  |  |
ICAR | Earnout Consideration |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum earnout consideration | 3,800,000 |  |  |  |  |  |  |  |  |
Earnout consideration liability |  |  |  |  | $ 1,800,000 |  |  | $ 1,800,000 |  |
Payment for contingent consideration liability |  | $ 1,800,000 |  | $ 1,100,000 |  |  |  |  |  |
ICAR | Earnout Consideration | Subsequent Event | Forecast |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Payment for contingent consideration liability |  |  | $ 800,000 |  |  |  |  |  |  |
ICAR | Maximum |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate purchase price | $ 13,900,000 |  |  |  |  |  |  |  |  |

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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 This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + 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=116859721&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 3: 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=116859721&loc=d3e6578-128477 + Details
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- Definition Amount of liabilities incurred by the acquirer as part of consideration transferred in a 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 7 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 4: 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=116859721&loc=d3e6613-128477 + Details
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- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116859824&loc=d3e6819-128478 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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- Definition Amount of cash outflow, not made soon after acquisition date of business combination, to settle contingent consideration liability up to amount recognized at acquisition date, including, but not limited to, measurement period adjustment and less amount paid soon after acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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