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

June 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

$

33,294 

$

$

$

33,294 

$

18,644 

$

$

$

18,644 

Commercial paper

10,048 

10,048 

10,983 

10,983 

Total cash and cash equivalents

33,294 

10,048 

43,342 

18,644 

10,983 

29,627 

Investments:

Commercial paper

51,929 

51,929 

16,971 

16,971 

Corporate debt securities

14,662 

14,662 

2,501 

2,501 

US government & agency securities

10,030 

10,030 

Total investments

76,621 

76,621 

19,472 

19,472 

Long-term restricted cash:

Cash

3,500 

3,500 

4,000 

4,000 

Total assets measured at fair value

$

36,794 

$

86,669 

$

$

123,463 

$

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

Six Months Ended June 30,

(in thousands)

2020

2019

Options to purchase common stock

20,485

23,414

RSUs with time-based vesting

5,109

1,121

RSUs with performance-based vesting

138

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)