Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net income	$ 1,910	$ 45,096	$ 32,909
Adjustments to reconcile net income to net cash and cash equivalents provided by operating activities:
Depreciation	5,965	4,848	3,990
Amortization of intangibles	10,445	1,534	1,940
Share-based compensation	10,585	6,062	5,670
Acquired inventory step-up amortization	15,370
Provision for doubtful accounts and inventory valuation	11,202	3,335	3,608
Deferred income taxes	(4,116)	2,163	17,207
Other, net	2,098	1,265	590
Change in operating assets and liabilities net of assets acquired and liabilities assumed in merger:
Accounts receivable	(9,721)	706	430
Income taxes	7,648	1,056	(4,727)
Inventories	(9,338)	(31,545)	(4,218)
Prepaid expenses and other assets	(5,079)	(3,101)	(1,686)
Accounts payable	(12,138)	3,512	3,198
Accrued and other liabilities	(6,685)	163	5,260
Net cash and cash equivalents provided by operating activities	18,146	35,094	64,171
Cash flows from investing activities:
Purchases of marketable securities	(127,462)	(140,018)	(164,661)
Proceeds from sales of marketable securities	94,486	186,332	143,349
Purchases of property, plant and equipment	(6,802)	(7,542)	(10,210)
Cash acquired from merger	43,882
Cash advance on convertible note receivable		(5,000)
Purchase of intangible assets			(1,000)
Net cash and cash equivalents provided by (used in) investing activities	4,104	33,772	(32,522)
Cash flows from financing activities:
Redemption of stock warrants			(1,025)
Purchases of common stock	(744)	(21,069)
Tax payments related to shares withheld for share-based compensation plans	(2,540)	(1,921)	(1,358)
Payment of contingent consideration for acquired business	(1,758)	(1,543)	(792)
Issuance of shares through share-based compensation plans	844	624	623
Net cash and cash equivalents used in financing activities	(4,198)	(23,909)	(2,552)
Effect of exchange rate changes on cash and cash equivalents	233	(339)	814
Net increase in cash and cash equivalents	18,285	44,618	29,911
Cash and cash equivalents at beginning of year	112,388	67,770	37,859
Cash and cash equivalents at end of year	130,673	112,388	67,770
Supplemental disclosure of cash flow information:
Income taxes paid (received), net	$ (3,848)	$ 4,301	14,605
Litigation settlement received			$ 13,000