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Stockholders' Equity (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2021

Dec. 31, 2020

Stockholders' Equity (Deficit)

Schedule of fair value of stock option awards valuation assumptions

​

​	​	​	​	​	​	​
​		2020		2019		2018
Exercise price	​	$2.29 – $2.55	​	$2.54 – $2.55	​	$2.96 – $3.07
Expected dividend yield	​	0%	​	0%	​	0%
Expected volatility	​	41% – 46%	​	38% – 39%	​	37% – 39%
Expected term (years)	​	5.55 – 6.07	​	5.80 – 6.09	​	5.65 – 6.25
Risk free interest rate	​	0.26% – 1.17%	​	1.58% – 2.35%	​	2.47% – 3.04%

Schedule of stock options activity

​

​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	Weighted		​	Weighted	​	​
​	​	​	​	Average		​	Average	​	Aggregate
​	​	Number of	​	Exercise		​	Remaining	​	Intrinsic
​		Shares		Price			Term		Value
Balance as of December 31, 2020		32,127		$	1.96		5.01		$	19,248
Granted		2,028	​	​	2.79			​	​	​
Exercised		(798)	​	​	0.73			​	​	​
Forfeited		(7,738)	​	​	2.97			​	​	​
Expired		(1,603)	​	​	2.78			​	​	​
Balance as of September 30, 2021		24,016		$	1.69		2.59		$	25,699
Expected to vest at September 30, 2021		2,357		$	2.74		9.35	​	​	—
Exercisable at September 30, 2021		24,016		$	1.69		2.59		$	25,699

​

​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	Weighted		​	Weighted	​	​	​
​	​	​	​	Average		​	Average	​	Aggregate
​	​	Number of	​	Exercise		​	Remaining	​	Intrinsic
​		Shares		Price			Term		Value
Balance as of December 31, 2019		35,016	​	$	2.00		5.03	​	$	24,634
Granted		335	​		2.46	​	—	​	​	—
Exercised		(230)	​		0.62	​	—	​	​	—
Forfeited		(1,700)	​		2.86	​	—	​	​	—
Expired		(1,294)	​		2.22	​	—	​	​	—
Balance as of December 31, 2020		32,127	​	$	1.96		5.01	​	$	19,248
Expected to vest at December 31, 2020		8,427	​	$	2.94		7.98	​		—
Exercisable at December 31, 2020		24,611	​	$	1.65		4.12	​	$	19,248

Schedule of the restricted stock unit activity

​

​	​	​	​	​	​
​		​	​	Weighted Average
​	​	​	​	Grant-Date Fair
​		Shares		Value
Outstanding as of December 31, 2020		8,268		$	2.61
Granted		9,260	​	​	2.81
Vested		—	​	​	—
Forfeited		(359)	​	​	2.70
Outstanding as of September 30, 2021		17,169		$	2.71

A summary of the restricted stock unit activity is presented below (in thousands, except per share amounts):

​	​	​	​	​	​
​	​	​	​	Weighted Average
​	​	​	​	Grant-Date Fair
​		Shares		Value
Outstanding as of December 31, 2019		8,433	​	$	2.63
Granted		1,003	​		2.38
Vested		—	​		—
Forfeited		(1,168)	​		2.67
Outstanding as of December 31, 2020		8,268	​	$	2.61

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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