6. Revenue


	Three Months Ended				Six Months Ended
	June 30,				June 30,
(in thousands)	2018		2019		2018		2019
Collaboration revenues	$	—	$	—	$	6,500	$	1,000
Research premium		709		351		1,479		744
Government grants		138		174		419		484
Total	$	847	$	525	$	8,398	$	2,228

The collaboration revenue for the six months ended June 30, 2018 reflects the amounts recorded from the Sinovant License Agreement (see Note 11) and includes the $5.0 million non-refundable upfront payment received as consideration for entering into the license agreement with Sinovant as well as $1.5 million of variable consideration related a future milestone payment that the Company received in the first quarter of 2019. The $1.0 million of collaboration revenue for the six months ended June 30, 2019 reflects the upfront payment under the Sunovion License Agreement received in April 2019 (see Note 12). The remainder of the revenue in the three and six months ended June 30, 2018 and 2019 reflects governmental research premiums, non-refundable government grants and the benefit of government loans at below-market interest rates.