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GE Royalty Obligation (Details)
3 Months Ended
Mar. 31, 2018
USD ($)
Tier 1 | Minimum  
Net Sales in Contract Year $ 0
Tier 1 | Maximum  
Net Sales in Contract Year $ 50,000,000
Percentage of the Contract Year Net Sales owed to GE 7.00%
Tier 2 | Minimum  
Net Sales in Contract Year $ 50,000,000
Tier 2 | Maximum  
Net Sales in Contract Year $ 100,000,000
Percentage of the Contract Year Net Sales owed to GE 6.00%
Tier 3 | Minimum  
Net Sales in Contract Year $ 100,000,000
Percentage of the Contract Year Net Sales owed to GE 5.00%