Balance Sheet Account Detail

(a) Property and Equipment

Property and equipment consisted of the following:



	March 31, 2020			December 31, 2019
Production equipment, molds and office furniture	$	10,919		$	10,844
Computer hardware and software	7,895			7,897
Leasehold improvements	15,594			15,594
Construction in progress (software and related implementation, production equipment and leasehold improvements)	694			795
Property and equipment, at cost	35,102			35,130
Accumulated depreciation	(22,629		)	(21,978		)
Property and equipment, net	$	12,473		$	13,152

Depreciation expense for property and equipment for the three months ended March 31, 2020 and 2019 was $0.7 million and $0.9 million, respectively.

(b) Inventories

Inventories consisted of the following:



	March 31, 2020		December 31, 2019
Raw materials	$	5,165	$	5,362
Work-in-process	4,463		4,132
Finished goods	14,858		16,911
Total Inventories	$	24,486	$	26,405

The change in the carrying amount of goodwill for the three months ended March 31, 2020 was as follows:



Balance at December 31, 2019	$	120,814
Foreign currency translation adjustment	(31		)
Balance at March 31, 2020	$	120,783

Other intangible assets consisted of the following:



	March 31, 2020							December 31, 2019
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Indefinite-lived intangible assets:
Trademarks and trade names	$	2,708	N/A			$	2,708	$	2,708	N/A			$	2,708
In-process research and development	$	11,200	N/A			11,200		11,200		N/A			11,200
Total indefinite-lived intangible assets	13,908					13,908		13,908					13,908
Finite-lived intangible assets:
Developed technology	67,600		(13,797		)	53,803		67,600		(13,467		)	54,133
Customer relationships	7,500		(3,125		)	4,375		7,500		(2,938		)	4,562
Total finite-lived intangible assets	75,100		(16,922		)	58,178		75,100		(16,405		)	58,695
Other intangible assets, net	$	89,008	$	(16,922	)	$	72,086	$	89,008	$	(16,405	)	$	72,603

Amortization expense for intangible assets for the three months ended March 31, 2020 and 2019 was $0.5 million and $0.9 million, respectively.

Estimated amortization expense for the 5 succeeding years and thereafter is as follows:



Remainder of 2020	$	2,444
2021	3,276
2022	3,320
2023	3,379
2024	3,499
2025	3,726
Thereafter	38,534
Total	$	58,178

(d) Fair Value Measurements

The following fair value hierarchy table presents information about each major category of the Company’s assets and liabilities measured at fair value on a recurring basis as of March 31, 2020 and December 31, 2019:



		March 31, 2020								December 31, 2019
		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Financial liabilities:
Contingently issuable common stock	(a)	$	—	$	—	$	200	$	200	$	—	$	—	$	500	$	500
Derivative liabilities	(b)	$	—	$	—	2,330		2,330		—		—		940		940
Total financial liabilities		$	—	$	—	$	2,530	$	2,530	$	—	$	—	$	1,440	$	1,440

(a) See Note 9 for additional details.

(b) See Note 6 for additional details.

Changes in the fair value of the Company’s Level 3 liabilities were as follows:



	Contingently issuable common stock (a)			Derivative liabilities (b)
Balance at December 31, 2019	$	500		$	940
Retirement due to debt extinguishment	—			(1,351		)
Additions	—			12,916
Fair value adjustment	(300		)	(10,175		)
Balance at March 31, 2020	$	200		$	2,330

(a) See Note 9 for additional details.

(b) See Note 6 for additional details.

There were no transfers of financial assets or liabilities into or out of Level 3 during the three months ended March 31, 2020. The derivative liabilities as of March 31, 2020 is classified within accrued expenses and other current liabilities on the Company’s Condensed Consolidated Balance Sheet.

Financial Instruments Not Recorded at Fair Value on a Recurring Basis

The table below summarizes the carrying and fair values of the Company’s debt:



	March 31, 2020				December 31, 2019
	Carrying value		Fair value		Carrying value		Fair value
Term loan facility	$	135,627	$	132,969	$	141,274	$	131,892
Convertible notes	32,234		27,771		37,111		24,548
Other debt	4,281		1,259		4,281		1,416
	$	172,142	$	161,999	$	182,666	$	157,856

The fair values of the Company’s debt are determined using Level 3 inputs, with the exception of the 3.25% Senior Notes, which are determined using Level 2 inputs. See Note 6 for further details. The carrying value of the Company’s Revolving loan facility approximates fair value.

The following table provides quantitative information about Level 3 inputs for fair value measurement of derivative liabilities and term loan facility as of March 31, 2020 and December 31, 2019. Significant increases or decreases in these inputs in isolation could result in a significant impact on our fair value measurement:



		March 31, 2020	December 31, 2019
Simulation Input
Volatility	(a)	93%	50%
Yield	(b)	27%	24%

(a) Based on weighted average of implied and historical volatility, used to forecast variability of Company's future stock price.

(b) Based on yields from market comparables, adjusted for each instrument's seniority, for discounting future cash flows.