Net loss per share attributable to common stockholders (Tables)

3 Months Ended

Mar. 31, 2021

Net loss per share attributable to common stockholders

Schedule of Computation of basic and diluted earnings per common share

	Three months ended
	March 31,
	2021		2020
Net loss	$	(8,082)	$	(2,143)
Dividends accrued on redeemable convertible preferred stock		(1,190)		(1,190)
Accretion of redeemable convertible preferred stock		(296)		(296)
Adjusted net loss attributable to common stockholders	$	(9,568)	$	(3,629)
Weighted average common shares used in net loss per share
attributable to common stockholders, basic and diluted		2,706,133		2,288,875
Basic and diluted net loss per common share outstanding	$	(3.54)	$	(1.59)

Schedule of Antidilutive shares excluded from computation

	Three months ended
	March 31,
	2021	2020
Series A Convertible Preferred Stock (as converted to common stock)	2,151,641	2,151,641
Series B Redeemable Convertible Preferred Stock (as converted to common stock)	5,886,405	5,886,405
Series C Redeemable Convertible Preferred Stock (as converted to common stock)	11,473,110	11,473,110
Series D Redeemable Convertible Preferred Stock (as converted to common stock)	7,034,423	7,034,423
Outstanding stock options	4,947,296	3,852,087
Performance-based stock options	21,459	28,163
Warrant to purchase Series D convertible preferred stock (as converted to common stock)	158,274	158,274
Total	31,672,608	30,584,103