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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%

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