Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Measurements

Schedule of financial assets and liabilities subject to fair value measurements

	As of
	December 31, 2018		Level 1	Level 2		Level 3
	(In thousands)
Assets:
Money market funds and cash equivalents	$	15,755	—	$	15,755		—
Marketable securities		69,712	—		69,712		—
	$	85,467	—	$	85,467		—
Liabilities:
Kolltan acquisition contingent consideration	$	13,779	—		—	$	13,779
	$	13,779	—		—	$	13,779

	As of
	December 31, 2017		Level 1	Level 2		Level 3
	(In thousands)
Assets:
Money market funds and cash equivalents	$	24,061	—	$	24,061		—
Marketable securities		99,139	—		99,139		—
	$	123,200	—	$	123,200		—
Liabilities:
Kolltan acquisition contingent consideration	$	43,400	—		—	$	43,400
	$	43,400	—		—	$	43,400

Schedule of the Company's contingent consideration liabilities measured at fair value using Level 3 inputs

The following table reflects the activity for the Company’s contingent consideration liabilities measured at fair value using Level 3 inputs for the year ended December 31, 2018 (in thousands):

	Other Liabilities:
	Contingent
	Consideration
Balance at December 31, 2017	$	43,400
Fair value adjustments included in operating expenses		(29,621)
Balance at December 31, 2018	$	13,779