CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Operating activities:
Net loss	$ (8,992)	$ (8,212)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization	3,475	3,738
Stock-based compensation	1,767	1,219
Amortization of debt discount and debt issuance costs	1,090	1,423
Provision for doubtful accounts	110	(72)
Provision for excess and obsolete inventory	2,212	892
Deferred income tax expense	(1,238)	(1)
Gain on settlement	(6,168)
Gain on sale of assets		(856)
Gain on disposal of instruments	(285)
Accretion to contingent consideration	100
Other non-cash items		394
Changes in operating assets and liabilities:
Accounts receivable, net	3,346	5,458
Inventories, net	(2,905)	(617)
Prepaid expenses and other current assets	49	2,611
Other assets	(55)	317
Accounts payable	(620)	(3,546)
Accrued expenses and other	1,768	(5,069)
Other long-term liabilities	(2,168)	(4,400)
Deferred revenue	(197)	246
Net cash used in operating activities	(8,711)	(6,475)
Investing activities:
Purchases of property and equipment	(2,387)	(5,348)
Cash paid for acquisition of SafeOp Surgical, Inc.	(14,344)
Cash received from sale of equipment	348
Net cash used in investing activities	(16,383)	(5,348)
Financing activities:
Borrowings under lines of credit	44,500	47,114
Repayments under lines of credit	(46,634)	(50,669)
Principal payments on capital lease obligations	(60)	(293)
Proceeds from sale of stock, net	51,538	17,630
Principal payments on term loan	(1,800)	(2,557)
Net cash provided by financing activities	47,544	11,225
Effect of exchange rate changes on cash	(4)	(47)
Net increase (decrease) in cash	22,446	(645)
Cash at beginning of period, including discontinued operations	22,466	19,752
Cash at end of period, including discontinued operations	44,912	19,107
Supplemental disclosure of cash flow information:
Cash paid for interest	2,282	2,437
Cash paid for income taxes	72	69
Purchases of property and equipment in accounts payable	$ 531	$ 374

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-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
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The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

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- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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-Publisher FASB
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-Topic 230
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-SubTopic 10
-Section 45
-Paragraph 12
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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer).

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The cash outflow for a borrowing supported by a written promise to pay an obligation.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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