Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2018

Schedule of financial assets and liabilities subject to fair value measurements

	As of March 31, 2018		Level 1	Level 2		Level 3
	(In thousands)
Assets:
Money market funds and cash equivalents	$	27,177	—	$	27,177	—
Marketable securities	83,424		—	83,424		—

	$	110,601	—	$	110,601	—

Liabilities:
Kolltan acquisition contingent consideration	$	29,800	—	—		$	29,800

	$	29,800	—	—		$	29,800

	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 three months ended March 31, 2018 (in thousands):

	Other Liabilities: Contingent Consideration

Balance at December 31, 2017	$	43,400
Fair value adjustments included in operating expenses	(13,600		)

Balance at March 31, 2018	$	29,800