Net Loss Per Share (Tables)

6 Months Ended

Jun. 30, 2019

Earnings Per Share [Abstract]

Schedule of Anti-dilutive Weighted-Average Equity Instruments Excluded from Calculation of Diluted Net Loss Per Share

The following weighted-average equity instruments were excluded from the calculation of diluted net loss per share because their effect would have been anti-dilutive for the periods presented:

	Six Months Ended
	June 30, 2019		June 30, 2018
Awards under equity incentive plan		3,295,666		1,691,286
Nonvested restricted shares and restricted stock units		130,000		190,595
Warrants to purchase common stock		869,035		890,170
Total		4,294,701		2,772,051

Reconciles Basic Earnings Per Share and Diluted Earnings Per Share of Common Stock

The following table reconciles basic earnings per share of common stock for the three and six months ended June 30, 2019 and 2018:

	Three Months Ended						Six Months Ended
	June 30, 2019			June 30, 2018			June 30, 2019			June 30, 2018
Net loss	$	(21,939	)	$	(11,594	)	$	(34,051	)	$	(38,442	)
Net loss attributable to common stockholders		(21,939	)		(11,594	)		(34,051	)		(38,442	)
Undistributed earnings and net loss attributable to    common stockholders, basic and diluted		(21,939	)		(11,594	)		(34,051	)		(38,442	)
Weighted average common shares outstanding, basic    and diluted		38,440,647			31,433,494			37,235,209			31,376,425
Basic and diluted EPS	$	(0.57	)	$	(0.37	)	$	(0.91	)	$	(1.23	)