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Business Acquisition and Purchase of Technology - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 20, 2017 | Sep. 30, 2017 | Sep. 30, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |
Cash consideration paid |  |  | $ 9,415 |
Goodwill |  | $ 14,950 | 14,950 | $ 9,773
Discrete tax benefit from release of deferred tax asset valuation allowance | $ 2,200 |  |  |
Acquired Technology [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated useful life |  | 2 years |  |
Intangible assets acquired |  | $ 400 | $ 400 |
Motion AI, Inc. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquisition effective date |  |  | Sep. 20, 2017 |
Business acquisition, description of acquired entity |  |  | On September 20, 2017, the Company acquired 100% of the equity interests of Motion AI, Inc., a Delaware technology corporation that allows users to scale one-to-one communications. The acquisition strengthens the Company’s position in the one-to-one communication space. Under the terms of the purchase agreement, the Company paid $9.0 million. The excess of the purchase consideration over the fair value of net tangible and identifiable intangible assets and liabilities acquired was recorded as goodwill and is primarily attributable to expanded market opportunities. |
Percentage of equity interests acquired | 100.00% |  |  |
Cash consideration paid | $ 9,000 |  |  |
Business combination, assets acquired and liabilities assumed, tangible assets | 32 |  |  |
Goodwill | 5,200 |  |  |
Business combination, potential consideration not included in purchase price allocation | $ 4,000 |  |  |
Potential consideration recording period, if earned | 3 years |  |  |
Motion AI, Inc. [Member] | Developed Technology [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated useful life | 2 years |  |  |
Motion AI, Inc. [Member] | Acquired Technology [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets acquired | $ 6,000 |  |  |

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- Definition With respect to a business combination completed during the period, this element provides a description of the business, other than the name, which may include the industry, size, products and other important information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Amount of other deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. For example, but not limited to, acquisition-date income tax benefits or expenses recognized from changes in the acquirer's valuation allowance for its previously existing deferred tax assets resulting from a business combination and adjustments to beginning-of-year balance of a valuation allowance because of a change in circumstance causing a change in judgment about the realizability of the related deferred tax asset in future periods. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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