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Selected Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Selected Quarterly Financial Data

 

 

Year Ended December 31, 2018

 

 

 

Q1

 

 

Q2

 

 

Q3

 

 

Q4

 

Total revenues

 

$

165

 

 

$

1,254

 

 

$

1,461

 

 

$

5,318

 

Net loss

 

$

(38,958

)

 

$

(39,444

)

 

$

(40,528

)

 

$

(39,969

)

Basic and diluted net loss per share

 

$

(0.63

)

 

$

(0.63

)

 

$

(0.65

)

 

$

(0.64

)

Shares used to compute basic and diluted net loss per share

 

 

61,744

 

 

 

62,346

 

 

 

62,650

 

 

 

62,694

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Year Ended December 31, 2017

 

 

 

Q1

 

 

Q2

 

 

Q3

 

 

Q4

 

Total revenues

 

$

148

 

 

$

105

 

 

$

53

 

 

$

21

 

Net loss

 

$

(25,287

)

 

$

(20,318

)

 

$

(22,128

)

 

$

(27,421

)

Basic and diluted net loss per share

 

$

(0.60

)

 

$

(0.41

)

 

$

(0.38

)

 

$

(0.45

)

Shares used to compute basic and diluted net loss per share

 

 

41,830

 

 

 

49,700

 

 

 

57,650

 

 

 

61,007