CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income		$ 3,190	$ 425
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		1,070	1,140
Amortization of marketable securities premium		43	27
Impairment charge on equity investee			313
Stock-based compensation		467	312
Realized gain on sale of available-for-sale securities			(77)
Loss from equity method investments, net		334	620
Changes in operating assets and liabilities:
Accounts receivable		1,686	(3,156)
Inventories		(4,553)	1,065
Prepaid expenses and other current assets		993	318
Other assets		(64)	246
Accounts payable		334	1,424
Accrued liabilities	[1]	(2,096)	(1,373)
Other long-term liabilities, including royalties		191	(211)
Net cash provided by operating activities		1,595	1,073
Cash flows from investing activities:
Purchases of property, plant and equipment		(11,849)	(268)
Purchases of available-for-sale securities		(9,938)	(21,716)
Proceeds from sales of available-for-sale investments		14,680	8,970
Net cash used in investing activities		(7,107)	(13,014)
Cash flows from financing activities:
Proceeds from issuance of common stock and options exercised, net of issuance costs		66	32,675
Dividends paid by joint ventures to their minority shareholders			(465)
Net cash provided by financing activities		66	32,210
Effect of exchange rate changes on cash and cash equivalents		283	91
Net increase (decrease) in cash and cash equivalents		(5,163)	20,360
Cash and cash equivalents at the beginning of the period		44,352	36,152
Cash and cash equivalents at the end of the period		$ 39,189	$ 56,512

[1] * Dividend accrued but not paid by one of our consolidated subsidiaries of $552 and $503 was included in accrued liabilities as of March 31, 2018 and 2017, respectively.