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Summary of Significant Accounting Policies - Net Loss Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator:
Net loss	$ (61,854)	$ (66,514)	$ (128,218)	$ (140,667)
Denominator:
Weighted average common shares used in calculation of basic net loss per share (in shares)	96,633	81,806	93,206	79,685
Effect of dilutive securities:
Dilutive securities, convertible debt (in shares)	0	0	0	0
Weighted average common shares outstanding used in calculation of diluted net loss per share (in shares)	96,633	81,806	93,206	79,685
Net loss per share:
Basic and diluted (in dollars per share)	$ (0.64)	$ (0.81)	$ (1.38)	$ (1.77)
Common stock options
Effect of dilutive securities:
Dilutive securities, share-based payment (in shares)	0	0	0	0
Restricted stock and RSUs
Effect of dilutive securities:
Dilutive securities, share-based payment (in shares)	0	0	0	0

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