CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net income		$ 220	$ 11,888
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization		4,173	3,445
Amortization of marketable securities premium		26	120
Impairment charge on equity investee		1,068
Stock-based compensation		1,709	1,392
Loss on disposal of equipment		43	25
Gain from deconsolidation of a subsidiary		(175)
Loss from equity method investments, net		757	21
Return on equity method investments		362
Changes in operating assets and liabilities:
Accounts receivable		1,876	(917)
Inventories		8,272	(14,637)
Prepaid expenses and other current assets		3,277	(3,492)
Other assets		(3,108)	48
Accounts payable		(4,993)	1,283
Accrued liabilities	[1]	(6,216)	745
Other long-term liabilities, including royalties		46	(148)
Net cash provided by (used in) operating activities		7,337	(227)
Cash flows from investing activities:
Purchases of property, plant and equipment		(13,969)	(34,289)
Proceeds from sale of equipment			11
Purchases of available-for-sale securities		(8,725)	(9,936)
Proceeds from sales and maturities of available-for-sale securities		20,988	18,590
Net cash used in investing activities		(1,706)	(25,624)
Cash flows from financing activities:
Proceeds from common stock options exercised		267	264
Proceeds from sale of previously consolidated subsidiary shares		366
Consideration paid to repurchase subsidiary shares from noncontrolling interests		(262)	(415)
Proceeds from short-term loan		5,760	291
Net cash provided by financing activities		6,131	140
Effect of exchange rate changes on cash and cash equivalents		(451)	(606)
Net increase (decrease) in cash and cash equivalents		11,311	(26,317)
Cash and cash equivalents at the beginning of the period		16,526	44,352
Cash and cash equivalents at the end of the period		27,837	18,035
Supplemental disclosure of non-cash flow information:
Consideration payable to repurchase subsidiary shares from noncontrolling interests, included in accrued liabilities		151	1,192
Reduction of noncontrolling interests in excess (deficit) of total consideration paid and payable in connection with the repurchase of subsidiary shares from noncontrolling interests		$ (74)	$ 187

[1] * Dividend accrued but not paid by one of our consolidated subsidiaries of $0 and $505 was included in accrued liabilities as of September 30, 2019 and 2018, respectively.