Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2021

Accounting Policies [Abstract]

Schedule of Contract with Customer, Asset and Liability

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 June 30, 2021 and December 31, 2020 (in thousands):

	June 30, 2021		December 31, 2020
Deferred revenue	$	7,471	$	5,508
Other long-term liabilities	13,841		10,426
Total	$	21,312	$	15,934

Schedule of Reconciliation of Change in Product Warranty Liabilities

The following table provides a reconciliation of the changes in product warranty liabilities for the three and six months ended June 30, 2021 and 2020 (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Balance at beginning of period	$	23,169	$	16,761	$	22,075	$	16,724
Provision for warranties issued during the period	8,020		4,844		13,916		9,658
Settlements made during the period	(4,751)		(3,331)		(9,007)		(6,721)
Decrease in warranty estimates	(770)		(451)		(1,316)		(1,838)
Balance at end of period	$	25,668	$	17,823	$	25,668	$	17,823

As of June 30, 2021 and December 31, 2020, total product warranty reserves of $25.7 million and $22.1 million, respectively, were included in the following consolidated balance sheet accounts (in thousands):

	June 30, 2021		December 31, 2020
Other current liabilities	$	9,795	$	8,409
Other long-term liabilities	15,873		13,666
Total warranty reserve	$	25,668	$	22,075

Schedule of Earnings Per Share, Basic and Diluted

For the three months ended June 30, 2021, the numerator and denominator of the diluted net income per share computation are calculated as follows:

	Three Months Ended June 30,
(in thousands)	2021
Net income - basic and diluted	$	4,008
Weighted average shares outstanding - basic	62,717
Dilutive common share equivalents:
Options to purchase common stock	2,550
Unvested restricted stock units	246
Warrants to purchase common stock	148
Awards to be granted under the ESPP	2
Convertible senior notes (if-converted)	—
Weighted average shares outstanding - diluted	65,663

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):

	Three Months Ended June 30,		Six Months Ended June 30,
	2021	2020	2021	2020
Options to purchase common stock	—	6,195	5,136	5,992
Unvested restricted stock units	—	132	170	132
Warrants to purchase common stock	30	640	251	640
Awards to be granted under the ESPP	—	8	4	4
Convertible senior notes (if-converted)	2,554	1,375	2,554	688
	2,584	8,350	8,115	7,456