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Accrued expenses and other current liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Jun. 30, 2015
Accrued expenses and other current liabilities      
Accrued purchases $ 4,734 $ 6,406  
Accrued employee compensation and benefits payable 536 368  
Other current liabilities 51 744  
Total $ 5,321 $ 7,518 $ 3,877