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COMMITMENTS AND CONTINGENCIES - FUTURE MINIMUM RENT COMMITMENTS (Details) $ in Thousands		3 Months Ended		6 Months Ended	9 Months Ended
	Mar. 31, 2016 ft²	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)
Cambridge Lease
Future minimum rent commitments
2016		$ 319		$ 319	$ 319
2017		1,289		1,289	1,289
2018		1,088		1,088	1,088
Total		2,696		2,696	2,696
Commitments
Total rent expense		210	$ 297		707	$ 891
CRISPR Therapeutics
Commitments
Total square feet \| ft²	5,233
Required days for notice	30 days
Sublease receipts recorded as offset to rent expense				154
Remainder of 2016		77		77	77
2017		$ 26		$ 26	$ 26