Long-Term Investments

12 Months Ended

Dec. 31, 2021

Investments, Debt and Equity Securities [Abstract]

6. LONG-TERM INVESTMENTS

As of December 31, 2020 and 2021, the Company held equity investments in several privately-held companies with the carrying value as follows:


	Percentage of Ownership						December 31
	2020			2021			2020		2021
							US$		US$
Equity securities measured at cost:
Cashido Corp. (Cashido)		0.6	%		0.6	%		—		—
Vastview Technology, Corp. (Vastview)		2.9	%		2.9	%		—		—
Deep Vision, Inc (Deep Vision)		16.2	%		14.4	%		5,000		6,500
BIWIN Storage Technology Corp.(BIWIN)		—			0.3	%		—		2,041

								5,000		8,541

In June 2018, the Company invested US$3,000 thousand in the preferred stock of Deep Vision which is accounted for under the cost method. Deep Vision is a developer of

low-power

deep-learning processors. In March 2020 and May 2021, the Company invested additional US$2,000 thousand and 1,500 thousand, respectively, in the preferred stock of Deep Vision.

In July 2021, the Company invested US$2,041 thousand in the common stock of BIWIN, which is accounted for under the cost method. BIWIN is a leading module maker in China focusing on solid state storage devices and is one of our customers.