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Segment and Geographic Information - Segment Geographic Information on Revenues and Long-Lived Assets by Geographic (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Entity Wide Revenue Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues | $ 20,961 | $ 22,732 | $ 15,905 | $ 15,153 | $ 11,599 | $ 11,774 | $ 9,874 | $ 6,960 | $ 74,751 | $ 40,207 | $ 22,251
Property and equipment, net | 2,757 |  |  |  | 2,006 |  |  |  | 2,757 | 2,006 | 1,470
United States and Canada |  |  |  |  |  |  |  |  |  |  |
Entity Wide Revenue Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 40,743 | 25,952 | 9,215
Property and equipment, net | 2,701 |  |  |  | 1,916 |  |  |  | 2,701 | 1,916 | 1,376
Europe, Middle East, and Africa |  |  |  |  |  |  |  |  |  |  |
Entity Wide Revenue Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 5,691 | 3,494 | 12,488
Property and equipment, net | 41 |  |  |  | 73 |  |  |  | 41 | 73 | 94
Asia Pacific and China |  |  |  |  |  |  |  |  |  |  |
Entity Wide Revenue Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 23,608 | 9,269 | 503
Property and equipment, net | 15 |  |  |  | 17 |  |  |  | 15 | 17 | 0
Mexico, Central America, and South America |  |  |  |  |  |  |  |  |  |  |
Entity Wide Revenue Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 4,709 | 1,492 | 45
Property and equipment, net | $ 0 |  |  |  | $ 0 |  |  |  | $ 0 | $ 0 | $ 0

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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: 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(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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(14)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + 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 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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