XML 37 R27.htm IDEA: XBRL DOCUMENT
v3.22.1

Cash, Cash Equivalents and Short-Term Investments (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2022
Cash, Cash Equivalents and Short-Term Investments |
Schedule of cash, cash equivalents and short-term investments | Cash, cash equivalents and short-term investments consisted of the following as of March 31, 2022 and December 31, 2021 (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31,
​ |  | 2022 |  | 2021
Cash | ​ | $ | 32,647 | ​ | $ | 27,788
Cash equivalents: | ​ |  | ​ | ​ | ​ | ​
Money market mutual fund | ​ |  | 101,801 | ​ | ​ | 111,313
Total cash and cash equivalents | ​ |  | 134,448 | ​ | ​ | 139,101
Short-term investments: | ​ |  | ​ | ​ | ​ | ​
U.S. Treasury notes and bills | ​ |  | 316,939 | ​ | ​ | 223,896
Mutual funds | ​ |  | 105,536 | ​ | ​ | 110,006
Corporate debt securities | ​ | ​ | 42,588 | ​ | ​ | 155,796
Total short-term investments | ​ |  | 465,063 | ​ | ​ | 489,698
Cash, cash equivalents and short-term investments | ​ | $ | 599,511 | ​ | $ | 628,799
​
Schedule of available-for-sale debt securities | The amortized cost, gross unrealized gains, gross unrealized losses and fair value of available-for-sale investments by type of security at March 31, 2022 were as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | ​ | ​
​ |  | Cost |  | Gains |  | Losses |  | Fair Value
U.S. Treasury notes | ​ | $ | 322,728 | ​ | $ | — | ​ | $ | (5,789) | ​ | $ | 316,939
Corporate debt securities | ​ | ​ | 50,831 | ​ | ​ | — | ​ | ​ | (8,243) | ​ | ​ | 42,588
Total available-for-sale investments | ​ | $ | 373,559 | ​ | $ | — | ​ | $ | (14,032) | ​ | $ | 359,527
​ The amortized cost, gross unrealized gains, gross unrealized losses and fair value of available-for-sale investments by type of security at December 31, 2021 were as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Unrealized | ​ | Unrealized | ​ | ​ | ​
​ |  | Amortized Cost |  | Gains |  | Losses |  | Fair Value
U.S. Treasury notes | ​ | $ | 226,020 |  | $ | 12 | ​ | $ | (2,136) | ​ | $ | 223,896
Corporate debt securities | ​ | ​ | 157,527 |  | ​ | — |  | ​ | (1,731) | ​ | ​ | 155,796
Total available-for-sale investments | ​ | $ | 383,547 |  | $ | 12 | ​ | $ | (3,867) | ​ | $ | 379,692
Schedule of investments based on stated contractual maturities | The following table summarizes the fair value of available-for-sale investments based on stated contractual maturities as of March 31, 2022: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Amortized Cost |  | Fair Value
Due within one year | ​ | $ | 37,955 | ​ | $ | 37,885
Due after one year through five years | ​ |  | 319,994 | ​ |  | 307,103
Due after five years through ten years | ​ | ​ | 15,610 | ​ | ​ | 14,539
Total | ​ | $ | 373,559 | ​ | $ | 359,527
​ The following table summarizes the fair value of available-for-sale investments based on stated contractual maturities as of December 31, 2021: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Amortized Cost |  | Fair Value
Due within one year | ​ | $ | 39,081 |  | $ | 39,035
Due after one year through five years | ​ |  | 328,776 |  |  | 325,047
Due after five years through ten years | ​ | ​ | 15,690 | ​ | ​ | 15,610
Total | ​ | $ | 383,547 |  | $ | 379,692
Schedule of unrealized losses on investments | Unrealized losses during 2022 and 2021 related to equity securities held at March 31, 2022 and 2021 are as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31,
​ |  | 2022 |  | 2021
Net losses recognized during the three months on equity securities | ​ | $ | (4,908) | ​ | $ | (263)
Less: net gains (losses) recognized during the year on equity securities sold during the year | ​ |  | — | ​ | ​ | —
Unrealized losses recognized during the three months on equity securities still held at March 31, 2022 and 2021 | ​ | $ | (4,908) | ​ | $ | (263)

X
- References No definition available. + Details
Name: | us-gaap_CashAndCashEquivalentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
Name: | us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of cash, cash equivalents, and investments. + References No definition available. + Details
Name: | us-gaap_ScheduleOfCashCashEquivalentsAndShortTermInvestmentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of unrealized gains and losses on investments. + References No definition available. + Details
Name: | us-gaap_UnrealizedGainLossOnInvestmentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration