Summary of Significant Accounting Policies and Other Information (Tables)

12 Months Ended

Dec. 31, 2020

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedules of Concentration of Risk, by Risk Factor

The following table presents customers individually accounting for more than 10% of the Company’s net sales:

	For the Year Ended December 31,
	2020		2019
Customer A	14	%	13	%
Customer B	11	%	17	%

The following table presents customers individually accounting for more than 10% of the Company’s accounts receivable:

	As of December 31,
	2020		2019
Customer A	16	%	**
Customer B	**		49	%
Customer C	22	%	**

**    Less than 10% of the total

The following table presents suppliers individually accounting for more than 10% of the Company’s purchases:

	For the Year Ended December 31,
	2020		2019
Supplier A	22	%	25	%
Supplier B	**		13	%

Schedule of Inventory, Current

Inventories consist of the following:

(in thousands)	As of December 31,
Inventories	2020		2019
Raw materials	$	89,684	$	90,677
Work in process	2,482		2,007
Finished goods	19,375		19,119
Total inventories	111,541		111,803
Inventory allowance	(3,328)		(2,964)
Inventories, net	$	108,213	$	108,839

Activity in the Company’s inventory allowance was as follows:

(in thousands)	For the Year Ended December 31,
Inventory Allowance	2020		2019
Balance at beginning of period	$	2,964	$	5,730
Charged to expense	1,436		677
Write-offs	(1,072)		(3,443)
Balance at end of period	$	3,328	$	2,964

Summary of Property, Plant and Equipment

Estimated useful lives by each type of asset category are as follows:

	Years
Buildings	Up to 39
Leasehold improvements	Lesser of (i) expected useful life of improvement or (ii) life of lease (including likely extension thereof)
Machinery and equipment	1 to 10

Property, plant and equipment by type were as follows:

(in thousands)	As of December 31,
Property, Plant and Equipment	2020		2019
Leasehold improvements	$	6,725	$	6,745
Machinery and equipment	43,030		41,243
Construction in progress	1,670		1,679
Total property, plant and equipment, at cost	51,425		49,667
Accumulated depreciation	(31,244)		(26,473)
Property, plant and equipment, net	$	20,181	$	23,194

Schedule of Other Accrued Liabilities

Other accrued liabilities consisted of the following:

(in thousands)	As of December 31,
Other Accrued Liabilities	2020		2019
Accrued product warranty	$	14,928	$	17,142
Litigation reserves *	3,128		5,020
Contract liabilities	47,960		26,898
Accrued compensation and benefits	3,124		6,599
Operating lease liabilities	3,793		3,789
Accrued interest expense	895		1,087
Other	3,791		5,495
Total	$	77,619	$	66,030

*As of December 31, 2020, litigation reserves related to various ongoing legal matters including associated legal fees. As of December 31, 2019, litigation reserves primarily consisted of accruals for the settlement of the SEC and USAO Investigations and the Federal Derivative Litigation. The Company concluded that insurance recovery was probable related to $1.9 million of the litigation reserves as of December 31, 2019, and recognized full recovery of the settlement amounts in Prepaid expenses and other current assets. See Note 10. Commitments and Contingencies for additional information.

Schedule of Product Warranty Liability

Accrued product warranty activities are presented below:

(in thousands)	For the Year Ended December 31,
Accrued Product Warranty	2020		2019
Balance at beginning of year	$	25,501	$	23,102
Current year provision *	18,272		10,349
Changes in estimates for preexisting warranties **	8,738		2,730
Payments made during the period	(20,969)		(10,680)
Balance at end of year	31,542		25,501
Less: Current portion	14,928		17,142
Noncurrent accrued product warranty	$	16,614	$	8,359

*Warranty costs, net of supplier recoveries, were $19.5 million and $10.1 million for the year ended December 31, 2020 and 2019, respectively. Supplier recoveries were $7.5 million and $2.2 million for the year ended December 31, 2020 and 2019, respectively.

**Change in estimates for preexisting warranties reflect changes in the Company’s estimate of warranty costs for products sold in prior periods. Such adjustments typically occur when claims experience deviates from historic and expected trends. The Company’s warranty liability is generally affected by failure rates, repair costs and the timing of failures. Future events and circumstances related to these factors could materially change the estimates and require adjustments to the warranty liability. In addition, new product launches require a greater use of judgment in developing estimates until historical experience becomes available. The Company recorded charges for changes in estimates for preexisting warranties of $8.7 million, or $0.38 per diluted share, and $2.7 million, or $0.13 per diluted share, for the years ended December 31, 2020 and 2019, respectively.