UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net loss	$ (8,300)	$ (63,967)
Adjustments to reconcile net loss to net cash used in operating activities:
Change in fair value of contingent consideration	(335)	0
Depreciation and amortization	307	2,191
Provision for doubtful accounts	0	597
Provision for excess and obsolete inventory	307	529
Impairment of right-of-use assets	0	7,434
Impairment of fixed assets	0	30,178
Impairment of intangible assets	0	19,842
Loss (gain) on sale of assets	2	(33)
Non-cash lease expense	105	184
Stock compensation expense	778	462
Deferred income tax provision (benefit)	2	(133)
Changes in current assets and liabilities:
Accounts receivable, net	255	1,675
Inventories, net	(78)	4,793
Income taxes receivable	267	(6,212)
Other current assets	405	3,645
Other long-term assets	541	0
Accounts payable	695	(7,666)
Accrued liabilities	(317)	(17,522)
Income taxes payable	89	226
Interest payable	12	0
Net cash used in operating activities	(5,265)	(23,777)
Cash flows from investing activities:
Capital expenditures	(19)	(42)
Proceeds from sale of business	0	3,281
Proceeds from sale of assets	2	34
Abandonment of patents and other intangible assets	0	49
Net cash (used in) provided by investing activities	(17)	3,322
Cash flows from financing activities:
Purchase of treasury stock	(105)	(45)
Proceeds from sale of common stock	38	349
Payments for finance leases	(14)	(51)
Net cash (used in) provided by financing activities	(81)	253
Effect of changes in exchange rates on cash and cash equivalents	23	(109)
Net change in cash, cash equivalents and restricted cash	(5,340)	(20,311)
Cash and cash equivalents at the beginning of period	38,660	100,575
Restricted cash at the beginning of period	664	663
Cash and cash equivalents and restricted cash at beginning of period	39,324	101,238
Cash and cash equivalents at end of period	33,945	80,263
Restricted cash at the end of period	40	664
Cash, cash equivalents and restricted cash at end of period	$ 33,985	$ 80,927