Net Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2020

Net Loss Per Share [Abstract]

Basic and Diluted Net Loss Per Share

Basic and diluted net loss per share attributable to common stockholders was calculated as follows:

	For the Years Ended December 31,
	2020			2019			2018
Numerator:
Net loss attributable to common stockholders	$	(139,700	)	$	(77,270	)	$	(74,518	)
Denominator:
Weighted-average common shares outstanding - basic and diluted		55,380,740			49,010,358			39,377,666
Net loss per share attributable to common stockholders - basic and diluted	$	(2.52	)	$	(1.58	)	$	(1.89	)

Antidilutive Securities Excluded from Computation of Diluted Net Loss Per Share

The Company excluded the following potential shares of common stock, presented based on amounts outstanding at each period end, from the computation of diluted net loss per share attributable to common stockholders for the periods indicated because including them would have had an anti-dilutive effect:

	For the Years Ended December 31,
	2020		2019		2018
Shares issuable upon conversion of the 2021 Convertible Notes		160,536		1,620,948		1,620,948
Shares issuable upon conversion of the 2022 Convertible Notes		1,195,449		-		-
Warrants exercisable for common shares		610,437		14,102		14,102
Options to purchase common shares		11,050,931		9,608,537		8,615,997
		13,017,353		11,243,587		10,251,047