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Stockholders' Equity - Summary of Stock-based Compensation Expense Recognized (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Stock-based compensation expense by type of award:
Stock-based compensation expense	$ 2,050	$ 1,565	$ 6,111	$ 6,930
Stock Option Plan Awards
Stock-based compensation expense by type of award:
Stock-based compensation expense		590	709	2,513
Restricted stock units and restricted stock awards
Stock-based compensation expense by type of award:
Stock-based compensation expense	1,878	834	4,853	3,882
Employee Stock Purchase Plan
Stock-based compensation expense by type of award:
Stock-based compensation expense	$ 172	$ 141	$ 549	$ 535

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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901

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-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
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-SubTopic 10
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