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RELATED PARTY TRANSACTIONS (Details) - USD ($)	1 Months Ended		12 Months Ended
	Aug. 31, 2012	Apr. 30, 2012	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
MPM
RELATED PARTY TRANSACTIONS
Due to Related Parties			$ 0
MPM | Consulting agreement
RELATED PARTY TRANSACTIONS
Expenses incurred by the entity			0	$ 100,000	$ 300,000
Member of board of directors
RELATED PARTY TRANSACTIONS
Due to Related Parties			0	100,000
Member of board of directors | Consulting agreement
RELATED PARTY TRANSACTIONS
Number of shares that can be purchased under option (in shares)	70,000	20,000
Exercise price of shares that can be purchased under option (in dollars per share)	$ 16.67	$ 11.02
Member of board of directors | Consulting agreement | Maximum
RELATED PARTY TRANSACTIONS
Expenses incurred by the entity			$ 0	$ 100,000	$ 100,000

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- Definition

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+ References

No definition available.

+ Details

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- Definition

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+ References

No definition available.

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- Definition

Carrying amount as of the balance sheet date of obligations due all related parties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 850
-SubTopic 10
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