Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis

The following presents our assets and liabilities measured at fair value on a recurring basis (in thousands):

	Fair Value Measurements on a Recurring Basis as of December 31, 2017
Fair value measurements in:	Level 1		Level 2		Level 3		Total
Assets:
Money market account	$	65,620	$	—	$	—	$	65,620
Total	$	65,620	$	—	$	—	$	65,620
Liabilities:
Subsidiary unit awards	$	—	$	—	$	3,160	$	3,160
Contingent consideration liability from acquisition	—		—		—		—
Total	$	—	$	—	$	3,160	$	3,160

	Fair Value Measurements on a Recurring Basis as of December 31, 2016
Fair value measurements in:	Level 1		Level 2		Level 3		Total
Assets:
Money market account	$	135,204	$	—	$	—	$	135,204
Total	$	135,204	$	—	$	—	$	135,204
Liabilities:
Subsidiary unit awards	$	—	$	—	$	2,768	$	2,768
Contingent consideration liability from acquisition	—		—		—		—
Total	$	—	$	—	$	2,768	$	2,768

Summary of Fair Value of Level 3 Liability

The following table summarizes the change in fair value of the Level 3 liabilities for subsidiary unit awards and the contingent consideration liability from acquisition (in thousands):

	Fair Value Measurements Using Significant Unobservable Inputs
	Year Ended December 31, 2017				Year Ended December 31, 2016
	Subsidiary Unit Awards		Contingent Consideration Liability from Acquisition		Subsidiary Unit Awards		Contingent Consideration Liability from Acquisition
Beginning of period balance	$	2,768	$	—	$	532	$	230
Total losses / (gains) included in earnings	392		—		2,236		(230		)
Ending of period balance	$	3,160	$	—	$	2,768	$	—