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Summary of significant accounting policies - (Tables)
9 Months Ended
Sep. 30, 2019
Accounting Policies [Abstract]  
Reconciliation of cash
The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the consolidated balance sheet that sum to the total of the same amounts shown in the statement of cash flows:
 
 
Beginning of period- December 31, 2018
 
End of period- September 30, 2019
Cash and cash equivalents
 
$
169,498

 
$
523,577

Restricted cash included in deposits and other assets
 

 
7,500

Total Cash, cash equivalents and restricted cash per statement of cash flows

 
$
169,498

 
$
531,077


Schedule of Inventory
The following table summarizes the components of the Company’s inventory for the periods indicated:
 
 
September 30, 2019
 
December 31, 2018
Raw materials
 
$
1,853

 
$
1,431

Work in progress
 
10,870

 
9,324

Finished goods
 
4,384

 
5,362

Total inventory
 
$
17,107

 
$
16,117