Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2021

Accounting Policies [Abstract]

Summary of Customers Accounted for 10% or More

The following table summarizes customers who accounted for 10% or more of accounts receivable, net:

	December 31,
	2021		2020
Customer A	*		12.7	%
Customer B	11.2	%	12.3	%

* Amount related to the respective customer represented less than 10% for the period presented.

The following table summarizes customers who accounted for 10% or more of total sales for the periods presented:

	Year Ended December 31,
	2021		2020		2019
Customer B	11.9	%	15.9	%	14.8	%
Customer C	*		12.9	%	15.4	%

* Amount related to the respective customer represented less than 10% for the period presented.

Schedule of Contract with Customer, Contract Asset, Contract Liability, and Receivable

Deferred revenue related to these performance obligations that are satisfied over time was included in the following consolidated balance sheet accounts in the amounts shown as of December 31, 2021 and 2020 (in thousands):

	December 31, 2021		December 31, 2020
Deferred revenue	$	9,625	$	5,508
Other long-term liabilities	16,940		10,426
Total	$	26,565	$	15,934

Summary of Reconciliation of Change in Estimated Warranty Liabilities

The following table provides a reconciliation of the changes in product warranty liabilities for the years ended December 31, 2021, 2020 and 2019 (in thousands):

	Year Ended December 31,
	2021		2020		2019
Balance at beginning of the year	$	22,075	$	16,724	$	9,138
Provision for warranties issued during the period	27,604		21,135		18,335
Settlements made during the period	(18,768)		(13,736)		(10,167)
Decrease in warranty estimates	(510)		(2,048)		(582)
Balance at end of the year	$	30,401	$	22,075	$	16,724

As of December 31, 2021 and December 31, 2020, total product warranty reserves of $30.4 million and $22.1 million, respectively, were included in the following consolidated balance sheet accounts (in thousands):

	December 31,
	2021		2020
Other current liabilities	$	13,076	$	8,409
Other long-term liabilities	17,325		13,666
Total warranty reserve	$	30,401	$	22,075

Schedule of Earnings Per Share, Basic and Diluted

For the year ended December 31, 2021, the numerator and denominator of the diluted net income per share computation were calculated as follows (in thousands):

	Year Ended December 31,
	2021
Net income - basic and diluted	$	15,566
Weighted average shares outstanding - basic	63,000
Dilutive common share equivalents:
Options to purchase common stock	1,129
Unvested restricted stock units	62
Warrants to purchase common stock	157
Awards to be granted under the ESPP	1
Weighted average shares outstanding - diluted	64,349

Schedule of Anti-Dilutive Securities

Potentially dilutive securities outstanding and not included in the calculation of diluted net loss per share (because inclusion would be anti-dilutive) are as follows (in thousands, in common stock equivalent shares):

	Year Ended December 31,
	2021	2020	2019
Options to purchase common stock	3,124	5,021	5,619
Unvested restricted stock units	—	78	N/A
Warrants to purchase common stock	1	379	611
Awards granted under the ESPP	—	3	5
Convertible senior notes (if-converted)	2,554	1,605	N/A
	5,679	7,086	6,235