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Summary of Significant Accounting Policies (Tables)
9 Months Ended
Sep. 30, 2020
Summary of Significant Accounting Policies [Abstract]  
Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis

September 30, 2020

December 31, 2019

(in thousands)

Level 1

Level 2

Level 3

Total

Level 1

Level 2

Level 3

Total

Assets

Cash and cash equivalents:

Cash and money market funds

$

41,784 

$

$

$

41,784 

$

18,644 

$

$

$

18,644 

Commercial paper

24,244 

24,244 

10,983 

10,983 

U.S. Treasury security

3,000 

3,000 

Total cash and cash equivalents

41,784 

27,244 

69,028 

18,644 

10,983 

29,627 

Investments:

Commercial paper

105,380 

105,380 

16,971 

16,971 

Corporate debt securities

21,195 

21,195 

2,501 

2,501 

U.S. government & agency securities

10,097 

10,097 

U.S. Treasury security

2,850 

2,850 

Total investments

139,522 

139,522 

19,472 

19,472 

Long-term restricted cash:

Cash

3,500 

3,500 

4,000 

4,000 

Total assets measured at fair value

$

45,284 

$

166,766 

$

$

212,050 

$

22,644 

$

30,455 

$

$

53,099 

Liabilities

Financing Derivative

$

$

$

$

$

$

$

$

Continuation Advances

Total liabilities measured at fair value

$

$

$

$

$

$

$

$

Anti-dilutive Shares Excluded from Computation of Diluted Net Income (Loss) per Share

Nine Months Ended September 30,

(in thousands)

2020

2019

Options to purchase common stock

19,921

23,048

RSUs with time-based vesting

5,971

1,094

RSUs with performance-based vesting

94

138

Schedule of Cumulative Effect on Consolidated Balance Sheet for Adoption of ASU 2016-13

Balance Sheets

Balance at December 31, 2019

Adjustments Due to Topic 326

Balance at January 1, 2020

Assets

Accounts receivable

$

15,266

$

(32)

$

15,234

Liabilities and Stockholders' Equity

Accumulated deficit

(1,066,240)

(32)

(1,066,272)