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Summary of Significant Accounting Policies - Summary of Product Revenue by Geographical Locations of Customers (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation Of Revenue [Line Items]
Total product revenue									$ 76,051	$ 51,326	$ 39,275
Product
Disaggregation Of Revenue [Line Items]
Total product revenue	$ 16,525	$ 15,399	$ 15,420	$ 13,564	$ 16,240	$ 10,797	$ 9,525	$ 7,006	60,908	43,568	37,183
Product | North America
Disaggregation Of Revenue [Line Items]
Total product revenue									12,696	6,325	4,569
Product | Europe, Middle East and Africa
Disaggregation Of Revenue [Line Items]
Total product revenue									46,974	36,241	30,716
Product | Other
Disaggregation Of Revenue [Line Items]
Total product revenue									$ 1,238	$ 1,002	$ 1,898

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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