The Company’s cash, cash equivalents, and investments consisted of the following:

At September 30, 2020 and December 31, 2019, cash and cash equivalents included bank balances and investments with original maturities less than 90 days. At September 30, 2020 and December 31, 2019, the Company’s cash equivalents were invested in highly liquid AAA rated money market funds that are required to comply with Rule 2a-7 of the Investment Company Act of 1940. Such funds utilize the amortized cost method of accounting, seek to maintain a constant $1.00 per share price, and are redeemable upon demand. The Company restricts its investments in AAA money market funds to those invested 100% in either short-term U.S. government agency securities or bank repurchase agreements collateralized by these same securities. The fair values of these money market funds are established through quoted prices in active markets for identical assets (Level 1 inputs). The Company’s cash in U.S. banks is insured by the Federal Deposit Insurance Corporation up to the insurable limit of $250.

The Company had $1.1 million and $2.1 million of cash and cash equivalents in bank accounts in China at September 30, 2020 and December 31, 2019, respectively. The Company’s cash in its China bank accounts is not insured. As of September 30, 2020, the Company has no intentions of repatriating the cash in its foreign bank accounts in China. If the Company decides to repatriate the cash in these China bank accounts, it may have trouble doing so in a timely manner. The Company may also be exposed to foreign currency fluctuations and taxes if it repatriates these funds.

At September 30, 2020 and December 31, 2019, the Company’s investments consisted of corporate bonds with ratings at the purchase date of A or higher and certificates of deposit. All the investments at September 30, 2020 and December 31, 2019 were classified as held-to-maturity. The bonds and certificates of deposit classified as short-term investments have original maturities greater than 90 days and mature within one year and the bonds and certificates of deposit classified as long-term investments have maturities greater

than one year but less than two years. The Company’s bond investments are recorded at the purchase price and carried at amortized cost.

Effective January 1, 2020, the Company adopted ASU 2016-13. This ASU replaces the incurred loss impairment model with an expected loss impairment model for financial instruments, including short-term investments. The amendment requires entities to consider forward-looking information to estimate expected credit losses. Under ASU 2016-13, the Company classifies its held-to-maturity investment portfolio by the investment type and further classifies the corporate bonds by the bond ratings. For estimating potential credit losses, the Company considers the historical loss data, the bond ratings, as well as and current and future economic conditions. The Company did not record an estimate for credit losses upon adoption of ASU 2016-13 on January 1, 2020 or during the nine months ended September 30, 2020.

Cash equivalents and investments were as follows at September 30, 2020 and December 31, 2019:

	September 30, 2020							December 31, 2019
	Level 1			Level 2		Total		Level 1		Level 2			Total
Cash equivalents:
Corporate bonds	$	0		$	0	$	0	$	0	$	708		$	708
Money market funds		1,560			0		1,560		782		0			782
Total Cash Equivalents	$	1,560		$	0	$	1,560	$	782	$	708		$	1,490
Short-Term Investments:
Corporate bonds	$	0		$	29,906	$	29,906	$	0	$	28,710		$	28,710
Certificates of deposit		3,197			0		3,197		3,846		0			3,846
Total Short-Term Investments	$	3,197		$	29,906	$	33,103	$	3,846	$	28,710		$	32,556
Long-Term Investments:
Corporate bonds	$	0		$	3,225	$	3,225	$	0	$	0		$	0
Certificates of deposit		510			0		510		0		0			0
Total Long-Term Investments	$	510		$	3,225	$	3,735	$	0	$	0		$	0
Cash equivalents and Investments - book value	$	5,267		$	33,131	$	38,398	$	4,628	$	29,418		$	34,046
Unrealized gains (losses)	$	(1	)	$	1	$	0	$	1	$	(11	)	$	(10	)
Cash equivalents and Investments - fair value	$	5,266		$	33,132	$	38,398	$	4,629	$	29,407		$	34,036

The Company categorizes its financial instruments within a fair value hierarchy according to accounting guidance for fair value. The fair value hierarchy is described under the Fair Value of Financial Instruments in Note 2. For the Level 2 investments, the Company uses quoted prices of similar assets in active markets. The fair values in the table above reflect no net difference between the book value and the fair value at September 30, 2020, and net unrealized losses of $10 at December 31, 2019.