Stock-Based Compensation - Schedule of Share-based Compensation Related to Restricted Stock Awards and Stock Options (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
General and administrative expense	$ 15,060	$ 11,290	$ 32,255	$ 18,863
Research and development expense	4,764	2,915	10,116	8,488
Sales and marketing expense	3,981		7,934
Total stock-based compensation expense			18,907	15,789
Restricted Stock Awards and Stock Options [Member]
General and administrative expense	6,892	7,035	15,929	12,807
Research and development expense	1,481	1,309	2,565	2,982
Sales and marketing expense	245		413
Total stock-based compensation expense	$ 8,618	$ 8,344	$ 18,907	$ 15,789

The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
-URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 985
-SubTopic 20
-Section 50
-Paragraph 1
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-Publisher FASB
-Name Accounting Standards Codification
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The aggregate total amount of expenses directly related to the marketing or selling of products or services.

+ References

No definition available.

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- Definition

Amount of noncash expense for share-based payment arrangement.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
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