Net Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2017

Net Loss Per Share

Schedule of Basic and diluted net loss per share

	Year Ended December 31,
	2017
Numerator:
Net loss	$	(29,727	)
Accretion of preferred stock to redemption value		(244	)
Net loss attributable to common stockholders for basic loss per share	$	(29,971	)
Less change in fair value of warrant liability	$	473
Net loss attributable to common stockholders for diluted loss per share	$	(30,444	)
Denominator:
Weighted average number of common shares outstanding—basic		9,161,844
Assumed conversion of dilutive securities:
Private Placement Warrants		26,743
Denominator for diluted loss per share—adjusted weighted average shares		9,188,587
Net loss per share attributable to common stockholders—basic	$	(3.27	)
Net loss per share attributable to common stockholders—diluted	$	(3.31	)

Schedule of potentially anti-dilutive securities excluded from calculation of diluted net loss per share

	Year Ended December 31,
	2017		2016
Options to purchase common stock		2,257,621		53,228
Warrants assumed from Macrocure		54,516		—
Convertible preferred stock and accrued dividends (as converted to common stock)		—		3,273,508
		2,312,137		3,326,736