Quarterly Results of Operations (Unaudited)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Quarterly Results of Operations (Unaudited)

19. Quarterly Results of Operations (Unaudited)

The following tables contain selected financial data for each quarter of the years ended December 31, 2018 and 2017. The Company believes that the following information reflects all normal recurring adjustments necessary for a fair presentation of the information for each quarter of the years ended December 31, 2018 and 2017. The operating results for any period are not necessarily indicative of results for any future periods.

	Year Ended December 31, 2018
	First Quarter			Second Quarter			Third Quarter			Fourth Quarter
Revenues	$	—		$	2,874		$	5,062		$	5,533
Net loss - Basic and Diluted		(16,767	)		(17,194	)		(19,400	)		(20,652	)
Loss per share - Basic and Diluted	$	(0.51	)	$	(0.52	)	$	(0.51	)	$	(0.52	)

	Year Ended December 31, 2017
	First Quarter			Second Quarter			Third Quarter			Fourth Quarter
Revenues	$	911		$	—		$	—		$	—
Net loss  - Basic and Diluted		(22,204	)		(9,300	)		(12,444	)		(14,177	)
Loss per share - Basic and Diluted	$	(0.81	)	$	(0.29	)	$	(0.38	)	$	(0.43	)	(a)

(a) The difference between the sum of net loss per share, basic and diluted, as calculated on a quarterly basis for 2017 ($1.91), and net loss per share, basic and diluted, for the year ended December 31, 2017 ($1.86) is due to the denominator used for the year ended December 31, 2017, which weights shares outstanding on a cumulative basis and reflects the issuance of 5.1 million shares of the Company’s common stock during the year ended December 31, 2017 (see Note 9, Stockholders’ Equity).