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Other Current Assets and Other Assets - Other Current Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Other Current Assets and Other Assets      
Non-trade receivables $ 5,674   $ 7,848
Prepaid maintenance 1,666   1,101
Prepaid other 890   998
Prepaid insurance 1,217   258
Prepaid purchase orders 773   4,442
Prepaid rent 4,016   3,330
Prepaid education and training 586   597
Other 66   157
Total other current assets $ 14,888 $ 12,961 $ 18,731