Balance Sheet Details (Tables)

12 Months Ended

Dec. 31, 2017

Balance Sheet Related Disclosures [Abstract]

Accounts receivable, net

Accounts receivable consist of the following (in thousands):

	December 31,
	2017			2016
Accounts receivable	$	15,328		$	19,870
Less allowance for doubtful accounts		(506	)		(1,358	)
Accounts receivables, net	$	14,822		$	18,512

Inventories, net

Inventories consist of the following (in thousands):

	December 31,
	2017			2016
Raw materials	$	4,969		$	7,301
Work-in-process		502			823
Finished goods		37,933			38,469
		43,404			46,593
Less reserve for excess and obsolete finished goods		(16,112	)		(16,500	)
Inventories, net	$	27,292		$	30,093

Property and equipment, net

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

	Useful lives		December 31,
	(in years)		2017			2016
Surgical instruments		4	$	53,198		$	53,095
Machinery and equipment		7		5,503			5,435
Computer equipment		3		3,500			3,511
Office furniture and equipment		5		2,794			2,695
Leasehold improvements	various			1,714			3,467
Construction in progress	n/a			336			445
				67,045			68,648
Less accumulated depreciation and amortization				(54,375	)		(53,572	)
Property and equipment, net			$	12,670		$	15,076

Intangible assets

Intangible assets consist of the following (in thousands except for useful lives):

	Remaining Avg. Useful lives		December 31,
	(in years)		2017			2016
Developed product technology		—	$	13,876		$	13,876
Intellectual property		—		1,004			1,004
License agreements		2		5,738			5,265
Trademarks and trade names		—		732			732
Customer-related		8		7,458			7,458
Distribution network		8		4,027			4,027
				32,835			32,362
Less accumulated amortization				(27,587	)		(26,651	)
Intangible assets, net			$	5,248		$	5,711

Schedule of intangible assets, future expected amortization expense

The future expected amortization expense related to intangible assets as of December 31, 2017 is as follows (in thousands):

Year Ending December 31,
2018	$	801
2019		757
2020		756
2021		756
2022		756
Thereafter		1,422
Total	$	5,248

Accrued expenses

Accrued expenses consist of the following (in thousands):

	December 31,
	2017		2016
Commissions and sales milestones	$	3,360	$	4,202
Payroll and payroll related		2,968		2,384
Litigation settlements		4,400		4,400
Globus related accruals		—		3,830
Accrued professional fees		1,484		3,093
Royalties		1,269		1,347
Restructuring and severance accruals		520		1,328
Accrued taxes		246		404
Guaranteed collaboration compensation, current		4,485		2,228
Accrued interest		376		387
Other		3,138		3,986
Total accrued expenses	$	22,246	$	27,589