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Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2022
Financial Instruments [Abstract]  
Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis

June 30, 2022

December 31, 2021

(in thousands)

Level 1

Level 2

Level 3

Total

Level 1

Level 2

Level 3

Total

Assets

Cash and cash equivalents

102,612 

207,833 

310,445 

327,315 

133,410 

460,725 

Investments:

Commercial paper

120,495 

120,495 

187,632 

187,632 

Corporate debt securities

46,810 

46,810 

8,968 

8,968 

U.S. government & agency securities

421,401 

421,401 

387,075 

387,075 

Total investments

588,706 

588,706 

583,675 

583,675 

Short-term restricted cash

300 

300 

500 

500 

Long-term restricted cash

2,922 

2,922 

4,592 

4,592 

Total assets measured at fair value

$

105,834 

$

796,539 

$

$

902,373 

$

332,407 

$

717,085 

$

$

1,049,492 

Liabilities

Contingent consideration

$

$

$

163,216 

$

163,216 

$

$

$

169,717 

$

169,717 

Total liabilities measured at fair value

$

$

$

163,216 

$

163,216 

$

$

$

169,717 

$

169,717 

Changes in the estimated fair value of contingent consideration liabilities [Table Text Block]

(in thousands)

Level 3

Beginning balance as of December 31, 2021

$

169,717

Change in estimated fair value

(6,501)

Ending balance as of June 30, 2022

$

163,216

Summary of Cash, Cash Equivalents and Investments

As of June 30, 2022

Gross

Gross

Amortized

unrealized

unrealized

Fair

(in thousands)

Cost

gains

losses

Value

Cash and cash equivalents

310,508

8

(71)

310,445

Investments:

Commercial paper

120,899

(404)

120,495

Corporate debt securities

47,083

(273)

46,810

U.S. government & agency securities

426,118

70

(4,787)

421,401

Total investments

594,100

70

(5,464)

588,706

Total cash, cash equivalents and investments

$

904,608

$

78

$

(5,535)

$

899,151

Short-term restricted cash

$

300

$

$

$

300

Long-term restricted cash

$

2,922

$

$

$

2,922

As of December 31, 2021

Gross

Gross

Amortized

unrealized

unrealized

Fair

(in thousands)

Cost

gains

losses

Value

Cash and cash equivalents

460,731

(5)

460,725

Investments:

Commercial paper

187,705

(73)

187,632

Corporate debt securities

8,964

9

(5)

8,968

U.S. government & agency securities

388,088

1

(1,014)

387,075

Total investments

584,757

10

(1,092)

583,675

Total cash, cash equivalents and investments

$

1,045,488

$

10

$

(1,097)

$

1,044,400

Short-term restricted cash

$

500

$

$

$

500

Long-term restricted cash

$

4,592

$

$

$

4,592

Summary of Contractual Maturities of Cash Equivalents and Available-for-Sale Investments

(in thousands)

Fair Value

Due in one year or less

$

687,193

Due after one year through five years

109,346

Total investments

$

796,539