Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
(Loss) income from continuing operations	$ (8,484)	$ 8,140	[1]
Loss from discontinued operations	(91)	(81)	[1]
Net (loss) income	(8,575)	8,059	[1],[2]
Adjustments to reconcile net (loss) income to cash (used in) provided by operating activities:
Depreciation and amortization	2,485	2,439
Provision for allowance for doubtful accounts	61	21
Inventory lower-of-cost-or-market/NRV adjustments	224	52
Stock-based compensation (benefit) expense	(365)	479
Loss on asset dispositions	424	0
Deferred income taxes, net of valuation allowance	(2,439)	838
Other	(31)	21
Changes in operating assets and liabilities:
Trade receivables	23,880	12,864
Inventories	7,617	15,283
Prepaids and other assets	1,771	230
Income taxes receivable	(108)	(13)
Trade payables	(47,158)	(26,016)
Accrued liabilities and other liabilities, including warranty obligations	(2,248)	1,339
Net cash (used in) provided by operating activities	(24,462)	15,596
Cash flows from investing activities:
Purchases of available-for-sale securities	0	(22,054)
Proceeds from maturities of available-for-sale securities	12,790	10,395
Purchases of property, plant and equipment	(1,551)	(1,262)
Purchases of other investments in noncontrolled affiliates	(2,250)	0
Net cash provided by (used in) investing activities	8,989	(12,921)
Cash flows from financing activities:
Proceeds from long-term debt	236	0
Payments on long-term debt	(11,667)	(4,000)
Payments for stock repurchases	0	(2,718)
Payments for finance lease obligations	(29)	0
Proceeds from exercise of stock options	39	100
Tax payments related to stock award issuances	(107)	(198)
Net cash used in financing activities	(11,528)	(6,816)
Effect of exchange rate changes on cash and cash equivalents	(64)	(5)
Decrease in cash and cash equivalents	(27,065)	(4,146)
Cash and cash equivalents:
Beginning of period	38,125	27,893
End of period	11,060	23,747
Supplemental disclosure of cash flow information:
Cash paid for interest	272	292
Cash paid for income taxes, net	62	493
Supplemental disclosure of non-cash investing activities:
Capital expenditures incurred but not yet paid	$ 611	$ 849

[1] May not add due to rounding.

[2]