CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating activities:
Net loss	$ (25,404)	$ (8,992)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	3,430	3,475
Stock-based compensation	3,963	1,767
Amortization of debt discount and debt issuance costs	1,033	1,090
Amortization of right-of-use asset	441
Provision for doubtful accounts	122	110
Provision for excess and obsolete inventory	4,123	2,212
Deferred income tax benefit	2	(1,238)
Gain on settlement		(6,168)
Beneficial conversion feature from convertible notes	242
Gain (loss) on disposal of instruments	66	(285)
Accretion to contingent consideration	289	100
Changes in operating assets and liabilities:
Accounts receivable, net	1,330	3,346
Inventories, net	(7,963)	(2,905)
Prepaid expenses and other current assets	285	49
Other assets	126	(55)
Other long-term assets	(2,690)
Accounts payable	4,322	(620)
Accrued expenses and other	1,201	1,768
Lease liability	2,639
Other long-term liabilities	(2,199)	(2,365)
Net cash used in operating activities	(14,642)	(8,711)
Investing activities:
Purchases of property and equipment	(3,717)	(2,387)
Cash received from sale of equipment		348
Net cash used in investing activities	(3,717)	(16,383)
Financing activities:
Proceeds from sale of common stock, net	1,401	51,538
Borrowings under lines of credit	54,220	44,500
Repayments under lines of credit	(54,488)	(46,634)
Principal payments on capital lease obligations	(12)	(60)
Proceeds from issuance of term debt, net	9,700
Principal payments on term loan	(3,045)	(1,800)
Net cash provided by financing activities	7,776	47,544
Effect of exchange rate changes on cash	99	(4)
Net increase (decrease) in cash	(10,484)	22,446
Cash at beginning of period, including discontinued operations	29,054	22,466
Cash at end of period, including discontinued operations	18,570	44,912
Supplemental disclosure of cash flow information:
Cash paid for interest	2,714	2,282
Cash paid for income taxes	102	72
Purchases of property and equipment in accounts payable	2,221	531
Common stock warrants issued with term loan draw	13,664
SafeOp Surgical, Inc.
Adjustments to reconcile net loss to net cash used in operating activities:
Accretion to contingent consideration	300
Investing activities:
Cash paid for acquisition of SafeOp Surgical, Inc.		$ (14,344)
Supplemental disclosure of cash flow information:
Common stock issued for achievement of SafeOp contingent consideration	$ 2,889