v3.8.0.1
Fair value measurement (Tables)
12 Months Ended
Dec. 31, 2017
Fair value measurement  
Schedule of financial assets that are measured at fair value on a recurring basis

                                                                                                                                                                                                                               

At December 31, 2017

 

Level 1

 

Level 2

 

Level 3

 

Total

 

Assets:

 

 

 

 

 

 

 

 

 

 

 

 

 

Money market accounts

 

$

2,255

 

$

 

$

 

$

2,255

 

​  

​  

​  

​  

​  

​  

​  

​  

Total assets

 

$

2,255

 

$

 

$

 

$

2,255

 

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

 

                                                                                                                                                                                                                           

At December 31, 2016

 

Level 1

 

Level 2

 

Level 3

 

Total

 

Assets:

 

 

 

 

 

 

 

 

 

 

 

 

 

Money market accounts

 

$

2,239

 

$

 

$

 

$

2,239

 

​  

​  

​  

​  

​  

​  

​  

​  

Total assets

 

$

2,239

 

$

 

$

 

$

2,239

 

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​