Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net loss	$ (74,207)	$ (81,152)
Loss from discontinued operations, net of tax		45,885
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation expense	40	242
Amortization of intangible assets	1,666	198
Impairment of intangible assets	6,588	14,005
Bad debt expense	439	80
Noncash interest expense	451	14
Loss on extinguishment of debt	71
Stock-based compensation	2,311	3,098
Warrant expense	49,027	145
Deferred income tax benefit	(1,143)	(3,448)
Loss on disposal of assets	486
Common stock warrant liability issuance costs	1,442
Other noncash items	57
Change in operating assets and liabilities:
Accounts and other receivables	(3,619)	(508)
Finished goods inventory	(332)	1,978
Prepaid expenses and other current assets	(442)	(802)
Accounts payable and accrued liabilities	1,629	(810)
Warranty liability	1,358
Other	(22)	999
Net cash used in operating activities - continuing operations	(14,200)	(20,076)
Net cash used in operating activities - discontinued operations		(7,414)
Net cash used in operating activities	(14,200)	(27,490)
Cash flows from investing activities:
Acquisition of LAP-BAND product line assets, including transaction costs	(2,000)	(10,279)
Purchases of property and equipment	(14)	(49)
Net cash used in investing activities - continuing operations	(2,014)	(10,328)
Net cash used in investing activities	(2,014)	(10,328)
Cash flows from financing activities:
Proceeds from issuance of subordinated convertible debentures	2,000
Payments of debt financing costs	(21)
Repayment of subordinated convertible debentures	(2,200)
Proceeds from warrants exercised	142	513
Proceeds from sale and issuance of equity securities	478	37,745
Proceeds from issuance of common stock warrant liabilities, net of issuance costs of $1,442	13,304
Payments of equity issuance costs	(44)	(4,555)
Preferred stock redemption		(500)
Net cash provided by financing activities - continuing operations	13,659	33,203
Net cash provided by financing activities	13,659	33,203
Effect of currency exchange rate changes on cash and cash equivalents	(8)
Net decrease in cash, cash equivalents and restricted cash	(2,563)	(4,615)
Cash and cash equivalents:
Cash, cash equivalents and restricted cash at beginning of period	5,548	10,163
Cash, cash equivalents and restricted cash at end of period	2,985	5,548
Noncash investing and financing activities:
Acquisition of LAP-BAND product line assets, asset purchase consideration payable		6,297
Down round adjustment for convertible preferred stock and warrants		$ 3,079
Conversion of common stock to convertible preferred stock	(1)
Common stock warrant liabilities reclassified to equity	$ 63,954