Balance Sheets Details (Tables)

12 Months Ended

Dec. 31, 2021

Balance Sheet Related Disclosures [Abstract]

Accounts receivable, net

Accounts receivable, net consist of the following (in thousands):

	December 31,
	2021			2020
Accounts receivable	$	44,200		$	23,887
Allowance for doubtful accounts		(2,307	)		(360	)
Accounts receivable, net	$	41,893		$	23,527

Inventories

Inventories consist of the following (in thousands):

	December 31,
	2021		2020
Raw materials	$	14,671	$	6,064
Work-in-process		5,712		1,982
Finished goods		71,320		37,955
Inventories	$	91,703	$	46,001

Property and equipment, net

Property and equipment, net consist of the following (in thousands, except as indicated):

	Useful lives		December 31,
	(in years)		2021			2020
Surgical instruments		4	$	130,432		$	76,669
Machinery and equipment		7		11,092			6,562
Computer equipment		3		5,694			4,206
Office furniture and equipment		5		3,861			1,380
Leasehold improvements	various			1,754			1,761
Construction in progress	n/a			7,292			2,738
				160,125			93,316
Less: accumulated depreciation				(72,724	)		(56,646	)
Property and equipment, net			$	87,401		$	36,670

Intangible assets, net

Intangible assets, net consist of the following (in thousands, except as indicated):

	Remaining Avg. Useful lives		Gross		Accumulated			Intangible
December 31, 2021:	(in years)		Amount		Amortization			Assets, net
Developed product technology		12	$	74,543	$	(5,768	)	$	68,775
Trademarks and trade names		10		5,732		(477	)		5,255
Customer relationships		5		14,732		(5,264	)		9,468
Distribution network		3		2,413		(1,840	)		573
In-process research and development	n/a			1,203		—			1,203
Total			$	98,623	$	(13,349	)	$	85,274
	Remaining Avg. Useful lives		Gross		Accumulated			Intangible
December 31, 2020:	(in years)		Amount		Amortization			Assets, net
Developed product technology		12	$	35,376	$	(23,056	)	$	12,320
License agreements		1		5,536		(965	)		4,571
Trademarks and trade names		—		792		(119	)		673
Customer relationships		3		7,458		(3,968	)		3,490
Distribution network		2		4,027		(1,639	)		2,388
In-process research and development	n/a			1,278		—			1,278
Total			$	54,467	$	(29,747	)	$	24,720

Schedule of intangible assets, future expected amortization expense

Future amortization expense related to intangible assets as of December 31, 2021 is as follows (in thousands):

Year Ending December 31,
2022	$	9,436
2023		9,436
2024		9,333
2025		8,748
2026		8,748
Thereafter		39,573
Total	$	85,274

Schedule of Goodwill

The change in the carrying amount of goodwill during the year ended December 31, 2021 included the following (in thousands):

December 31, 2020	$	13,897
Additions		27,841
Foreign currency fluctuation		(2,049	)
December 31, 2021	$	39,689

Accrued expenses and other current liabilities

Accrued expenses and other current liabilities consist of the following (in thousands):

	December 31,
	2021		2020
Payroll and payroll related	$	18,449	$	13,552
Commissions and sales milestones		12,420		7,038
Professional fees		4,684		3,551
Litigation settlement obligation		4,400		4,000
Royalties		3,466		2,293
Other taxes payable		3,004		248
Inventory in-transit		2,089		1,771
Administration fees		1,698		442
Interest		1,045		619
Other		4,294		1,750
Total accrued expenses and other current liabilities	$	55,549	$	35,264

Schedule of Other Long-Term Liabilities

Other long-term liabilities consist of the following (in thousands):

	December 31,
	2021		2020
Royalties	$	5,833	$	1,678
Litigation settlement obligation - long-term portion		3,587		7,634
Income tax-related liabilities		1,522		373
Contract liability		2,897		—
Other		3,222		1,703
Other long-term liabilities	$	17,061	$	11,388