Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

Stock-Based Compensation

Schedule of stock based compensation expense categories in statement of operations

	Year ended December 31,
	2019		2018		2017
Sales and marketing	$	164	$	68	$	44
General and administrative		225		115		116
Research and development		68		33		37
Total stock‑based compensation	$	457	$	216	$	197

Schedule of stock option activity

				Weighted
				average
		Weighted		remaining
	Number of	average exercise		contractual term
	shares	price per share		(years)
Outstanding at January 1, 2017	282,331	$	5.77
Granted	84,587		5.93
Exercised	(404)		5.19
Early exercised	(830)		5.93
Canceled/forfeited	(14,770)		5.87
Outstanding at December 31, 2017	350,914		5.81
Granted	152,016		5.93
Exercised	(1,377)		5.57
Early exercised	(427)		5.93
Canceled/forfeited	(11,904)		5.93
Outstanding at December 31, 2018	489,222		5.84
Granted	978,415		12.51
Exercised	(2,527)		5.93
Early exercised	(471)		5.93
Canceled/forfeited	(43,697)		8.58
Outstanding at December 31, 2019	1,420,942	$	10.35	8.75
Vested and expected to vest at December 31, 2019	1,317,047	$	10.23	8.68
Exercisable at December 31, 2019	345,881	$	5.87	6.18

Schedule of activity relating to early exercise of stock options

	Number of
	shares
Unvested balance at January 1, 2017	7,159
Early exercised	830
Vested	(6,955)
Unvested balance at December 31, 2018	1,034
Early exercised	427
Vested	(549)
Unvested balance at December 31, 2018	912
Early exercised	471
Vested	(628)
Unvested balance at December 31, 2019	755

Schedule of weighted average assumptions

	Year ended December 31,
	2019		2018		2017
Expected dividend yield	—		—		—
Expected volatility	55.9	%	56.5	%	50.0	%
Risk‑free interest rate	1.82	%	2.77	%	2.07	%
Expected term	6.24	Years	6.25	Years	6.25	Years