Net Loss Per Share - Reconciliation of Numerator and Denominators in Computing Net Loss per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Numerator:
Net loss	$ (55,630)	$ (25,800)
Denominator:
Shares used in per share calculation (in shares)	55,750	48,185
Net loss per share, basic and diluted (in dollars per share)	$ (1.00)	$ (0.54)