6. Balance Sheet Components

Inventory

Inventory at December 31, 2020 and 2019 consisted of the following:


	December 31,
(in thousands)	2020		2019
Raw Material	$	1,321	$	457
Work in Process		1,026		1,211
Finished Goods		435		461
Inventory	$	2,782	$	2,129

Property and Equipment, net

Property and equipment at December 31, 2020 and 2019 consisted of the following:


	December 31,
(in thousands)	2020		2019
Land	$	396	$	396
Lab equipment		418		411
Clinical equipment		65		65
Software		63		63
Total property and equipment at cost		942		935
Accumulated depreciation		(265)		(225)
Property and equipment, net	$	677	$	710

Depreciation and amortization expense was $40,000 and $50,000 for the years ended December 31, 2020 and 2019, respectively.

Intangible assets, net

Intangible assets, net of amortization, at December 31, 2020 and 2019 consisted of the following:


	December 31,
(in thousands)	2020		2019
Developed technology	$	25,000	$	25,000
Accumulated developed technology amortization		(5,694)		(4,028)
Developed technology, net		19,306		20,972
In-process research and development		4,800		8,800
Impairment		—		(4,000)
In process research and development, net		4,800		4,800
Trademarks		300		300
Accumulated trademark amortization		(69)		(48)
Trademarks, net		231		252
Total intangible assets, net	$	24,337	$	26,024

In June 2019, the Company determined that in-process research and development was impaired and recorded an impairment loss of $4.0 million in the consolidated statement of operations for the year ended December 31, 2019. Amortization expense of finite-lived intangibles was $1.7 million for the years ended December 31, 2020 and 2019.

The following table summarizes the Company’s estimated future amortization expense of intangible assets with finite lives as of December 31, 2020:


(in thousands)	Amounts
2021	$	1,687
2022		1,687
2023		1,687
2024		1,687
2025		1,687
Thereafter		11,102
	$	19,537

Accrued Liabilities

Accrued liabilities at December 31, 2020 and 2019 consisted of the following:


	December 31,
(in thousands)	2020		2019
Accrued vacation	$	277	$	273
Accrued payroll and commission		43		111
Accrued payroll tax		57		52
Accrued interest		696		357
Accrued consulting		31		257
Accrued distributor services fees		1,314		227
Accrued legal costs		291		292
Accrued audit and tax services		70		189
Accrued chargebacks and discounts		736		337
Accrued other		978		827
Total	$	4,493	$	2,922