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Summary of Significant Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2020
Summary of Significant Accounting Policies [Abstract]  
Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 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

$

32,529 

$

$

$

32,529 

$

18,644 

$

$

$

18,644 

Commercial paper

36,333 

36,333 

10,983 

10,983 

Total cash and cash equivalents

32,529 

36,333 

68,862 

18,644 

10,983 

29,627 

Investments:

Commercial paper

45,710 

45,710 

16,971 

16,971 

Corporate debt securities

12,924 

12,924 

2,501 

2,501 

US government & agency securities

15,095 

15,095 

Total investments

73,729 

73,729 

19,472 

19,472 

Long-term restricted cash:

Cash

4,000 

4,000 

4,000 

4,000 

Total assets measured at fair value

$

36,529 

$

110,062 

$

$

146,591 

$

22,644 

$

30,455 

$

$

53,099 

Liabilities

Financing Derivative

$

$

$

$

$

$

$

$

Continuation Advances

Total liabilities measured at fair value

$

$

$

$

$

$

$

$

Computation of Basic and Diluted Net Income (Loss) per Share

Three Month Ended March 31,

2020

2019

Net income (loss)

$

1,262

$

(30,324)

Basic

Weighted average shares used in computing basic net income (loss) per share

153,453

151,274

Basic net income (loss) per share

$

0.01

$

(0.20)

Diluted

Weighted average shares used in computing basic net income (loss) per share

153,453

  

151,274

Add: weighted average stock options

1,926

Add: weighted average restricted stock units

476

Weighted average shares used in computing diluted net income (loss) per share

155,855

151,274

Diluted net income (loss) per share

$

0.01

$

(0.20)

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

Three Months Ended March 31,

(in thousands)

2020

2019

Options to purchase common stock

14,265

23,833

RSUs with time-based vesting

2,208

1,102

RSUs with performance-based vesting

138

138

ESPP shares

1,346

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)