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MARKETABLE SECURITIES (Tables)

9 Months Ended

Sep. 30, 2021

Marketable Securities Abstract

Available-for-sale Securities

Amortized cost and estimated fair market value of marketable securities classified as available-for-sale (excluding cash equivalents) at September 30, 2021, were as follows:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Amortized

​

Gross Unrealized

​

Estimated Fair

(In thousands)

Cost

Gains

Losses

Market Value

Investments due in 3 months or less:

​

​

​

​

Commercial paper

​

$

69,079

​

$

—

​

$

—

​

$

69,079

Corporate securities

​

​

13,285

​

​

12

​

​

(1)

​

​

13,296

Total

​

82,364

​

12

​

(1)

​

82,375

Investments due in 4-12 months:

​

​

​

​

Commercial paper

​

​

40,500

​

​

—

​

​

—

​

​

40,500

Corporate securities

​

15,361

​

—

​

(4)

​

15,357

Total

​

55,861

​

—

​

(4)

​

55,857

Investments due in 12 months or greater:

​

​

​

​

Corporate securities

​

148,295

​

51

​

(72)

​

148,274

Total

​

​

148,295

​

51

​

​

(72)

​

148,274

Total marketable securities

​

$

286,520

​

$

63

​

$

(77)

​

$

286,506

Amortized cost and estimated fair market value of marketable securities classified as available-for-sale (excluding cash equivalents) at December 31, 2020, were as follows:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Amortized

​

Gross Unrealized

​

Estimated Fair

(In thousands)

Cost

Gains

Losses

Market Value

Investments due in 3 months or less:

​

​

​

​

Commercial paper

​

$

43,660

​

$

—

​

$

—

​

$

43,660

Corporate securities

​

​

19,846

​

​

44

​

​

—

​

​

19,890

Total

​

63,506

​

44

​

—

​

63,550

Investments due in 4-12 months:

​

​

​

​

Corporate securities

​

125,922

​

846

​

—

​

126,768

Total

​

125,922

​

846

​

—

​

126,768

Total marketable securities

​

$

189,428

​

$

890

​

$

—

​

$

190,318

Available-for-sale Securities in an Unrealized Loss Position

The following table summarizes marketable securities classified as available-for-sale (excluding cash equivalents) in a continuous unrealized loss position for which an allowance for credit losses was not recorded at September 30, 2021:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Less Than 12 Months

​

12 Months or Longer

​

Total

​

Estimated

Gross

Estimated

Gross

Estimated

Gross

​

​

Fair Market

​

Unrealized

​

Fair Market

​

Unrealized

​

Fair Market

​

Unrealized

(In thousands)

​

Value

​

Losses

​

Value

​

Losses

​

Value

​

Losses

Corporate securities

​

$

93,255

​

$

(77)

​

$

—

​

$

—

​

$

93,255

​

$

(77)

Total marketable securities

​

$

93,255

​

$

(77)

​

$

—

​

$

—

​

$

93,255

​

$

(77)

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

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X

- Definition

Tabular disclosure of fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27290-111563

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922888-210455

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X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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