We conduct business with a related party company, Lite-On Semiconductor Corporation and its subsidiaries and affiliates (collectively, “LSC”), and Nuvoton Technology Corporation and its subsidiaries and affiliates (collectively, “Nuvoton”). LSC is our largest stockholder, owning approximately 15% of our outstanding Common Stock as of September 30, 2019, and is a member of the Lite-On Group of companies. On August 8, 2019, we announced that we entered into an agreement with LSC pursuant to which the Company shall acquire LSC, see Note 13 for additional information. Raymond Soong, the Chairman of our Board of Directors, is the Chairman of LSC, and is the Chairman of Lite-On Technology Corporation (“LTC”), a significant shareholder of LSC. C.H. Chen, our former President and Chief Executive Officer and currently the Vice Chairman of our Board of Directors, is also Vice Chairman of LSC and a board member of LTC. Dr. Keh-Shew Lu, our President and Chief Executive Officer and a member of our Board of Directors, is a board member of LTC, and a board member of Nuvoton. We consider our relationships with LSC and Nuvoton to be mutually beneficial, and we plan to continue our strategic alliance with LSC and Nuvoton. We purchase wafers from Nuvoton for use in our production process.

We also conduct business with Keylink International (B.V.I.) Inc. and its subsidiaries and affiliates (collectively, “Keylink”). Keylink is our 5% joint venture partner in our Shanghai assembly and test facilities. We sell products to, and purchase inventory from Keylink. In addition, our subsidiaries in China lease their manufacturing facilities in Shanghai from, and subcontract a portion of our manufacturing process (metal plating and environmental services) to, Keylink. We also pay fees for plating and rental services and consulting to Keylink. The aggregate amounts paid to Keylink for the three months ended September 30, 2019 and 2018 were approximately $3.7 million and $3.8 million, respectively. The aggregate amounts paid to Keylink for the nine months ended September 30, 2019 and 2018 were approximately $11.5 million and $12.6 million, respectively. In addition, Chengdu Ya Guang Electronic Company Limited (“Ya Guang”) is our 2% joint venture partner in one of our Chengdu assembly and test facilities and is our 5% joint venture partner in our other Chengdu assembly and test facility; however, we have no material transactions with Ya Guang. We also purchase materials from Jiyuan Crystal Photoelectric Frequency Technology Ltd (“JCP”), a frequency control product manufacturing company in which we have made an equity investment and account for that investment using the equity method of accounting.

The Audit Committee of the Board reviews all related party transactions for potential conflict of interest situations on an ongoing basis, all in accordance with such procedures as the Audit Committee may adopt from time to time.

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2019		2018		2019		2018
LSC
Net sales	$	273	$	304	$	729	$	896
Purchases	$	2,548	$	5,208	$	11,039	$	16,630

Nuvoton
Purchases	$	2,650	$	2,361	$	5,951	$	7,774

Keylink
Net sales	$	4,923	$	4,684	$	11,304	$	8,762
Purchases	$	604	$	907	$	1,794	$	2,646

JCP
Purchases	$	151	$	201	$	462	$	488

The table below sets forth accounts receivable from, and accounts payable to, related parties:

	September 30,		December 31,
	2019		2018
LSC
Accounts receivable	$	337	$	286
Accounts payable	$	1,749	$	2,696
Nuvoton
Accounts payable	$	1,238	$	1,939
Keylink
Accounts receivable	$	15,004	$	6,264
Accounts payable	$	11,597	$	4,656
JCP
Accounts payable	$	206	$	151