COLLABORATION AGREEMENTS (Tables)

3 Months Ended

Mar. 31, 2018

The following table summarizes our total consolidated net revenues from collaborators, for the periods indicated, in thousands:

	Three Months Ended March 31,
Description	2018		2017
Sanofi Genzyme	$	18,853	$	12,277
MDCO		1,295		6,364
Other		1,751		319
Total net revenues from collaborators	$	21,899	$	18,960

Balance and Change in Contract Liabilities

The following table presents the balance of our contract liabilities at January 1, 2018 and March 31, 2018, in thousands, which at March 31, 2018 includes the achievement of the $50.0 million milestone under our collaboration with Sanofi Genzyme as discussed below:

	At January 1, 2018		At March 31, 2018
Contract liabilities:
Deferred revenues	$	16,570	$	43,531

During the three months ended March 31, 2018, we recognized the following revenues as a result of the change in the contract liability balances, in thousands:

Revenue recognized in the period from:		Three Months Ended March 31, 2018
Amounts included in contract liability at the beginning of the period		$	5,883

Schedule of Research and Development Expenses Incurred by Type that are Directly Attributable to Each Significant Agreement

The following table provides the research and development expenses incurred by type that are directly attributable to each significant agreement for the periods indicated, in thousands:

	Three Months Ended March 31,
	2018				2017
	Sanofi Genzyme		MDCO		Sanofi Genzyme		MDCO
Research and development
Clinical trial and manufacturing	$	10,523	$	641	$	40,575	$	5,095
External services		2,673		—		567		—
Other		509		—		1,436		24
Total research and development expenses	$	13,705	$	641	$	42,578	$	5,119

Prior Revenue Standard

Revenue from Collaborators

The following table summarizes our total consolidated net revenues from collaborators, using the prior revenue standard, for the periods indicated, in thousands:

	Three Months Ended March 31,
Description	2018		2017
Sanofi Genzyme	$	50,430	$	12,277
MDCO		2,845		6,364
Other		1,751		319
Total net revenues from collaborators	$	55,026	$	18,960