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Assets for lease, net (Tables)
 12 Months Ended
Dec. 31, 2016
Leases, Capital [Abstract]  
Schedule of assets for lease
​ ​ ​
As of December 31,
 ​
​ ​ ​
2016
 ​ ​
2015
 ​
Assets for lease
 ​ ​ ​ $ 1,361 ​ ​ ​ ​ $ 1,280 ​ ​
Less: accumulated depreciation
 ​ ​ ​ ​ (486) ​ ​ ​ ​ ​ (450) ​ ​
Assets for lease, net
 ​ ​ ​ $ 875 ​ ​ ​ ​ $ 830 ​ ​
​