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Basis of Presentation and Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2018
Accounting Policies [Abstract]  
Schedule of New Accounting Pronouncements and Changes in Accounting Principles
Below is a summary of the affected line items of the condensed balance sheets upon adoption of Topic 606 (in thousands):
 
 
Balance at December 31, 2017
 
Adjustments due to Topic 606
 
Balance at January 1, 2018
Balance Sheet
 
 
 
 
 
 
Deferred revenue (contract liabilities), non-current
 
1,921

 
(1,844
)
 
77

Accumulated deficit
 
(345,858
)
 
1,844

 
(344,014
)