Exhibit 12.1

		Year Ended December 31,												Six months ended  June 30
		2014				2015				2016				2017
Earnings:
Net loss		$	(9,890	)		$	(15,557	)		$	(20,467	)		$	(15,475	)
Fixed charges to add to earnings:
Interest expense		152				499				528				270
Amortization of financing costs		41				79				70				20
Rent interest factor (1)		62				66				105				61
Total fixed charges		255				644				703				351
Earnings before fixed charges		(9,635		)		(14,913		)		(19,764		)		(15,124		)
Ratio of earnings to fixed charges		N/A				N/A				N/A				N/A

Ratio of earnings to fixed charges is not applicable as the Company was deficient in earnings by approximately $9,635 and $14,913 and $19,764 for the years ended December 31, 2014, 2015 and 2016 respectively and approximately $15,124 for the six months ended June 30, 2017

(1)	Approximately one-third of rental expense is deemed representative of interest factor