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Basis of Presentation and Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
Accounting Policies [Abstract]  
Schedule of New Accounting Pronouncements and Changes in Accounting Principles
Additionally, the following tables present a summary of the amount by which each financial statement line item was affected as of and during the year ended December 31, 2018 by the application of ASC 606 as compared to ASC 605, the revenue recognition guidance that was in effect before this change in accounting principle (in thousands, except per share amounts):
 
December 31, 2018
 
ASC 606
 
ASC 605
 
Difference
Deferred revenue, current—related party
$
55,157

 
$
42,174

 
$
12,983

Deferred revenue, net of current portion—related party
$
42,715

 
$
22,844

 
$
19,871

Total liabilities
$
110,323

 
$
77,469

 
$
32,854

Accumulated deficit
$
(163,907
)
 
$
(131,053
)
 
$
(32,854
)
Total stockholders’ equity
$
104,129

 
$
136,983

 
$
(32,854
)
 
Year Ended December 31, 2018
 
ASC 606
 
ASC 605
 
Difference
Collaboration revenue—related party
$
65,201

 
$
51,142

 
$
14,059

Net loss
$
(27,379
)
 
$
(41,438
)
 
$
14,059

Net loss per share attributable to common stockholders, basic and diluted
$
(0.84
)
 
$
(1.27
)
 
$
0.43