Balance Sheet Components

12 Months Ended

Dec. 31, 2021

Balance Sheet Related Disclosures [Abstract]

Balance Sheet Components

3. Balance Sheet Components

Inventory

Inventory as of December 31 consisted of the following:

	2021		2020
	(in thousands)
Raw materials	$	4,911	$	2,114
Work in process		270		308
Finished goods		2,969		1,916
Total inventory	$	8,150	$	4,338

The Company recorded a reserve for excess and obsolete inventory of $0.7 million and $1.1 million as of December 31, 2021 and 2020, respectively.

Property and equipment, net

Property and equipment, net as of December 31 consisted of the following:

	2021			2020
	(in thousands)
Laboratory and warehouse equipment and tooling	$	5,937		$	5,120
Computer equipment and software		1,501			1,492
Office furniture and fixtures		1,489			1,489
Leasehold improvements		2,585			2,585
Automobiles		29			29
Construction in progress	418			719
		11,959			11,434
Less: accumulated depreciation		(9,593	)		(8,281	)
Property and equipment, net	$	2,366		$	3,153

Depreciation expense was $1.4 million and $2.1 million for the years ended December 31, 2021 and 2020, respectively. During 2021, approximately $0.1 million depreciation expense was recorded in Cost of sales, $0.8 million was recorded in Selling, general and administrative expenses, and $0.5 million was recorded in Research and development expenses in the consolidated statements of operations and comprehensive Loss. During 2020, approximately $0.5 million depreciation expense was recorded in Cost of sales, $1.2 million was recorded in Selling, general and administrative expenses, and $0.4 million was recorded in Research and development expenses in the accompanying consolidated statements of operations and comprehensive loss.

Intangible assets, net

Intangible assets as of December 31consisted of the following:

	2021
	Weighted Average Amortization Period	Gross		Accumulated Amortization		Net
	(in years)	(in thousands)
Developed Technology (5 - 10 years)	4.0	$	2,445	$	768	$	1,677
Customer relationships (7 years)	2.8		1,910		875		1,035
Tradenames (10 years)	0.8		360		116		244
Total intangible assets	7.6	$	4,715	$	1,759	$	2,956

	2020
	Weighted Average Amortization Period	Gross		Accumulated Amortization		Net
	(in years)	(in thousands)
Developed Technology (5 years)	1.6	$	1,110	$	490	$	620
Customer relationships (7 years)	4.0		1,910		603		1,307
Tradenames (10 years)	1.1		360		79		281
Total intangible assets	6.7	$	3,380	$	1,172	$	2,208

During 2021 and 2020, the Company did not record any impairment charges related to intangible assets.

Amortization expense was $0.6 million and $0.5 million in the years ended December 31, 2021 and 2020, respectively. During 2021, approximately $0.2 million amortization expense was recorded in Cost of sales and $0.4 million was recorded in Selling, general and administrative expenses in the accompanying consolidated statements of operations and comprehensive loss. During 2020, approximately $0.2 million amortization expense was recorded in Cost of sales and $0.3 million was recorded in Selling, general and administrative expenses in the accompanying consolidated statements of operations and comprehensive loss.

The following table presents estimated future annual amortization expense related to intangible assets, net as of December 31, 2021:

	Future Intangible Asset Amortization Expenses
	(in thousands)
2022	$	664
2023		618
2024		442
2025		386
2026		170
Thereafter		676
Total future amortization expense	$	2,956

Accrued Expenses

Accrued expenses as of December 31 consisted of the following:

	2021		2020
	(in thousands)
Vendor invoices	$	2,779	$	2,232
Other accrued expenses		1,979		1,015
Total accrued expenses	$	4,758	$	3,247

Other Current Liabilities

Other current liabilities as of December 31 consisted of the following:

	2021		2020
	(in thousands)
Finance lease liability	$	55	$	47
Contingent earnout		524		667
Warranty liability		1,132		1,202
Other current liabilities		771		840
Total other current liabilities	$	2,482	$	2,756

Other Liabilities

Other liabilities as of December 31 consisted of the following:

	2021		2020
	(in thousands)
Non-current finance lease liability	$	70	$	125
Non-current contingent earnout		—		263
Other non-current liabilities		488		388
Total other liabilities	$	558	$	776