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Commitments And Contingencies - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Commitment And Contingencies [Line Items] |  |  |
Rent expenses | $ 1,417 | $ 1,259 | $ 1,094
Minimum |  |  |
Commitment And Contingencies [Line Items] |  |  |
Royalty expenses percentage | 3.00% |  |
Maximum |  |  |
Commitment And Contingencies [Line Items] |  |  |
Royalty expenses percentage | 3.50% |  |
IIA |  |  |
Commitment And Contingencies [Line Items] |  |  |
Maximum royalty payment as percentage of grants received | 100.00% |  |
Aggregate contingent royalty liability (including interest) | $ 22,254 |  |
IIA | Cost of Revenue |  |  |
Commitment And Contingencies [Line Items] |  |  |
Royalty expenses | $ 1,016 | $ 539 | $ 482
IIA | Minimum |  |  |
Commitment And Contingencies [Line Items] |  |  |
Royalty expenses percentage | 3.00% |  |
IIA | Maximum |  |  |
Commitment And Contingencies [Line Items] |  |  |
Royalty expenses percentage | 3.50% |  |

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- Definition Percentage of royalty expense. + References No definition available. + Details
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- Definition Royalty payment percentage as percentage of grant received. + References No definition available. + Details
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- Definition Carrying value as of the balance sheet date of obligations incurred through that date and payable for royalties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6935-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6911-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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- Definition Amount of expense related to royalty payments under a contractual arrangement such as payment for mineral and drilling rights and use of technology or intellectual property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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