Net Loss Per Share - Weighted Average Shares (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Numerator:
Net Loss	$ (48,486)	$ (32,581)	$ 163,500
Denominator:
Weighted average common shares outstanding, basic and diluted	80,271,848	77,544,089
Net loss per share, basic and diluted	$ (0.60)	$ (0.42)