Revenue - Schedule of Disaggregation of Revenue by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation Of Revenue [Line Items]
Revenue	$ 68,335	$ 55,239	$ 189,278	$ 153,293
United States
Disaggregation Of Revenue [Line Items]
Revenue	55,245	44,790	151,346	124,586
Foreign
Disaggregation Of Revenue [Line Items]
Revenue	$ 13,090	$ 10,449	$ 37,932	$ 28,707
Sales Revenue \| Customer Concentration Risk \| Foreign
Disaggregation Of Revenue [Line Items]
Percentage of revenue generated outside of the United States	19.00%	19.00%	20.00%	19.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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