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Commitments and Contingencies Narrative (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
Long-term Purchase Commitment [Line Items]  
Contractual price $ 1,304
Purchase commitment, period 5 years
Other commitments, future minimum payments, remainder of fiscal year $ 1,450
Minimum  
Long-term Purchase Commitment [Line Items]  
Other commitment 3,000
Maximum  
Long-term Purchase Commitment [Line Items]  
Other commitment $ 4,000