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Description of Business (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accumulated deficit	$ 2,111,126	$ 2,045,462

X

- References

No definition available.

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- Definition

The cumulative amount of the reporting entity's undistributed earnings or deficit.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Publisher FASB
-Name Accounting Standards Codification
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-Topic 944
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 505
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-Publisher FASB
-Name Accounting Standards Codification
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