Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Operating activities:
Net loss	$ (36,548)	$ (43,129)
Less: Income from discontinued operations, net of income taxes	(7,894)	(10,733)
Loss from continuing operations	(44,442)	(53,862)
Adjustments to reconcile net loss to net cash from operating activities:
Depreciation	6,834	7,599
Amortization of intangible assets	1,237	809
Non-cash interest expense	1,837	444
Loss on lease due to restructuring	86	179
Defined benefit plan cost	700	416
Stock-based compensation expense	9,047	8,239
Gain on sale of property and equipment	(4)	0
Impairment of property and equipment	218	240
Tax benefit related to sale of product line	(1,534)	0
Provision for (recovery of) allowance on accounts receivable	(32)	10
Losses on write downs of inventory	1,534	2,144
Provision for warranties	92	325
Changes in operating assets and liabilities:
Trade and other accounts receivable	2,815	(9,354)
Inventories	(12,337)	5,563
Prepaid expenses and other assets	202	378
Accounts payable and accrued liabilities	(9,533)	10,986
Deferred revenue and other current liabilities	(1,757)	2,201
Accrued employee compensation	(235)	1,128
Deferred tax liability	(4,394)	(88)
Defined benefit plan and other long-term liabilities	(1,153)	(165)
Net cash used in operating activities - continuing operations	(50,819)	(22,808)
Net cash provided by operating activities - discontinued operations	(2,750)	7,802
Total net cash used in operating activities	(53,569)	(15,006)
Investing activities:
Purchases of property and equipment	(10,266)	(3,379)
Proceeds from sale of property and equipment	8	0
Cash used in acquisition, net of cash acquired	0	(97)
Proceeds from sale of product line	0	1,500
Net cash used in investing activities - continuing operations	(10,258)	(1,976)
Net cash provided by (used in) investing activities - discontinued operations	49,011	(2,418)
Total net cash provided by (used in) investing activities	38,753	(4,394)
Financing activities:
Repayments of line of credit and other borrowings	(15,414)	0
Line of credit borrowings	15,000	0
Proceeds from convertible debt, net of discount and issuance costs	0	42,991
Proceeds from sale of common stock, net of offering costs	22,950	0
Proceeds from issuance of common stock under equity compensation plans	444	326
Net cash provided by financing activities - continuing operations	22,980	43,317
Net cash used in financing activities - discontinued operations	(44)	(32)
Total net cash provided by financing activities	22,936	43,285
Effect of exchange rate changes on cash and cash equivalents	(214)	878
Increase in cash and cash equivalents	7,906	24,763
Cash and cash equivalents, beginning of period - continuing operations	46,192	8,122
Cash and cash equivalents, beginning of period - discontinued operations	3,930	17,237
Cash and cash equivalents, end of period	58,028	50,122
Cash and cash equivalents, end of period - discontinued operations	0	3,930
Cash and cash equivalents, end of period - continuing operations	58,028	46,192
Cash paid for:
Interest	2,805	82
Income taxes	49	45
Supplemental schedule of noncash investing and financing activities:
Purchases of property and equipment included in accounts payable and accrued liabilities	115	392
Equipment purchased under capital leases	1,911	0
Common stock issued for acquisition of Nesscap	0	25,294
Amounts in escrow related to sale of product line	$ 859	$ 0