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Summary of significant accounting policies (Tables)
 3 Months Ended
Mar. 31, 2018
Accounting Policies [Abstract]  
Schedule of Inventory
The following table summarizes the components of the Company’s inventory for the periods indicated:
 
 
March 31, 2018
 
December 31, 2017
Raw materials
 
$
768

 
$
452

Work in progress
 
4,786

 
3,912

Finished goods
 
6,801

 
6,390

Total inventory
 
$
12,355

 
$
10,754