Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator:
Net loss	$ (12,779)	$ (17,331)	$ (31,543)	$ (80,887)
Denominator:
Weighted-average common shares outstanding, basic (in shares)	113,828	111,315	113,437	110,633
Effect of potential dilutive common shares	0	0	0	0
Denominator:
Weighted-average common shares outstanding, diluted (in shares)	113,828	111,315	113,437	110,633
Earnings per share, basic	$ (0.11)	$ (0.16)	$ (0.28)	$ (0.73)
Earnings per share, diluted	$ (0.11)	$ (0.16)	$ (0.28)	$ (0.73)