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Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Beginning Balance | $ 37,970 | $ 12,819 |  |
Net foreign currency translation | (115) | (38) |  |
Amortization expense | (8,849) | (4,942) | $ (4,532) |
Ending Balance | 46,549 | 37,970 | 12,819 |
December 31, 2016 balance at cost |  |  |  | $ 78,746
Accumulated amortization |  |  |  | (32,197)
Ending Balance | 37,970 | 12,819 | 12,819 | 46,549
Silanis Technology Inc [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Measurement Period Adjustments - eSignLive | 17,400 |  |  |
Additions-eSignLive |  | 30,000 |  |
Amortization expense |  | (6,060) | (6,060) |
Other Acquisitions [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Additions-eSignLive | 143 | 131 |  |
Capitalized Technology [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Beginning Balance | 34,632 | 10,216 |  |
Net foreign currency translation | (58) | (15) |  |
Amortization expense | (4,182) | (4,569) |  |
Ending Balance | 11,392 | 34,632 | 10,216 |
December 31, 2016 balance at cost |  |  |  | 37,745
Accumulated amortization |  |  |  | (26,353)
Ending Balance | 34,632 | 10,216 | 10,216 | 11,392
Capitalized Technology [Member] | Silanis Technology Inc [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Measurement Period Adjustments - eSignLive | (19,000) |  |  |
Additions-eSignLive |  | 29,000 |  |
Capitalized Technology [Member] | Other Acquisitions [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Additions-eSignLive | 0 | 0 |  |
Customer Relationships [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Beginning Balance | 828 | 644 |  |
Net foreign currency translation | (57) | (23) |  |
Amortization expense | (2,597) | (193) |  |
Ending Balance | 24,774 | 828 | 644 |
December 31, 2016 balance at cost |  |  |  | 27,757
Accumulated amortization |  |  |  | (2,983)
Ending Balance | 828 | 644 | 644 | 24,774
Customer Relationships [Member] | Silanis Technology Inc [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Measurement Period Adjustments - eSignLive | 26,600 |  |  |
Additions-eSignLive |  | 400 |  |
Customer Relationships [Member] | Other Acquisitions [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Additions-eSignLive | 0 | 0 |  |
Other [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Beginning Balance | 2,510 | 1,959 |  |
Net foreign currency translation |  | 0 |  |
Amortization expense | (2,070) | (180) |  |
Ending Balance | 10,383 | 2,510 | 1,959 |
December 31, 2016 balance at cost |  |  |  | 13,244
Accumulated amortization |  |  |  | (2,861)
Ending Balance | 2,510 | 1,959 | $ 1,959 | $ 10,383
Other [Member] | Silanis Technology Inc [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Measurement Period Adjustments - eSignLive | 9,800 |  |  |
Additions-eSignLive |  | 600 |  |
Other [Member] | Other Acquisitions [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Additions-eSignLive | $ 143 | $ 131 |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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