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Loss Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator
Net loss	$ (27,791)	$ (34,245)	$ (85,978)	$ (23,789)	$ (15,160)	$ (28,287)	$ (148,014)	$ (67,236)
Denominator
Basic and diluted weighted average common shares (in shares)	226,143			225,415			225,951	225,043
Loss per common share:
Basic and diluted (in dollars per share)	$ (0.12)			$ (0.11)			$ (0.66)	$ (0.30)
Approximate number of unvested restricted stock units and stock to be issued pursuant to the ESPP that have been excluded from the computation of diluted loss per share as the effect would be anti-dilutive when results from operations are at a net loss position (in shares)	1,105			587			1,052	722

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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