Balance Sheet Details (Tables)

12 Months Ended

Dec. 31, 2018

Balance Sheet Related Disclosures [Abstract]

Accounts receivable, net

Accounts receivable consist of the following (in thousands):

	December 31,
	2018			2017
Accounts receivable	$	15,291		$	15,328
Less allowance for doubtful accounts		(196	)		(506	)
Accounts receivable, net	$	15,095		$	14,822

Inventories, net

Inventories consist of the following (in thousands):

	December 31,
	2018			2017
Raw materials	$	5,813		$	4,969
Work-in-process		952			502
Finished goods		40,165			37,933
		46,930			43,404
Less reserve for excess and obsolete		(18,165	)		(16,112	)
Inventories, net	$	28,765		$	27,292

Property and equipment, net

Property and equipment consist of the following (in thousands except for useful lives):

	Useful lives		December 31,
	(in years)		2018			2017
Surgical instruments		4	$	54,848		$	53,198
Machinery and equipment		7		5,971			5,503
Computer equipment		3		3,104			3,500
Office furniture and equipment		5		1,155			2,794
Leasehold improvements	various			1,765			1,714
Construction in progress	n/a			92			336
				66,935			67,045
Less accumulated depreciation and amortization				(53,700	)		(54,375	)
Property and equipment, net			$	13,235		$	12,670

Intangible assets, net

In conjunction with the acquisition of SafeOp in March 2018, the Company recorded $21.6 million of new intangible assets. See Note 8 for further information regarding the acquisition. Intangible assets, net consist of the following (in thousands, except as indicated):

	Remaining Avg. Useful lives		December 31,
	(in years)		2018			2017
Developed product technology		10	$	26,976		$	13,876
Intellectual property		—		1,004			1,004
License agreements		1		5,064			5,738
Trademarks and trade names		—		792			732
Customer-related		5		7,458			7,458
Distribution network		4		4,027			4,027
In process research and development		19		8,800			—
				54,121			32,835
Less accumulated amortization				(27,713	)		(27,587	)
Intangible assets, net			$	26,408		$	5,248

Schedule of intangible assets, future expected amortization expense

Future amortization expense related to intangible assets as of December 31, 2018 is as follows (in thousands):

Year Ending December 31,
2019	$	1,566
2020		1,890
2021		1,890
2022		1,890
2023		1,890
Thereafter		17,282
Total	$	26,408

Accrued expenses

Accrued expenses consist of the following (in thousands):

	December 31,
	2018			2017
Commissions and sales milestones	$	3,594		$	3,360
Payroll and payroll related		3,222			2,968
Litigation settlement obligation		4,400			4,400
Professional fees		2,637			1,484
Royalties		1,354			1,269
Restructuring and severance accruals		710			520
Taxes		(3	)		246
Guaranteed collaboration compensation, current		—			4,485
Interest		261			376
Acquisition related - contingent consideration		2,600			—
Other		3,541			3,138
Total accrued expenses	$	22,316		$	22,246