Stock-Based Compensation - Summary of Total Stock-based Compensation Expense by Function (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share based compensation expense	$ 7,439	$ 1,500
Sales and Distribution Expenses
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share based compensation expense	1,592	388
Research and Development Expense
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share based compensation expense	1,273	161
General and Administrative Expense
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share based compensation expense	$ 4,574	$ 951

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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