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Prepaid Expenses and Other Current Assets (Tables)
 6 Months Ended
Jun. 30, 2019
Prepaid Expense And Other Assets Current [Abstract]  
Summary of Prepaids and Other Current Assets

Prepaids and other current assets consisted of the following as of December 31, 2018 and June 30, 2019:

 

 

 

December 31,

2018

 

 

June 30,

2019

 

 

 

(in thousands)

 

Prepaid inventory

 

$

2,284

 

 

$

1,577

 

Restricted cash

 

 

550

 

 

 

307

 

Prepaid Insurance

 

 

434

 

 

 

2,987

 

Deferred offering costs

 

 

1,218

 

 

 

—

 

Other

 

 

932

 

 

 

880

 

Prepaid and other current assets

 

$

5,418

 

 

$

5,751