Fair Value Measurement (Tables)

6 Months Ended

Jun. 30, 2017

Fair Value Disclosures [Abstract]

Summary of Fair Value Measured on Recurring Basis

The financial instrument that is measured at fair value on a recurring basis is summarized as follows as of June 30, 2017:

	(in thousands)
Assets	Level 1		Level 2		Level 3		June 30, 2017
Derivative embedded conversion feature	$	—	$	—	$	73,298	$	73,298

The financial instrument that is measured at fair value on a recurring basis is summarized as follows as of December 31, 2016:

	(in thousands)
Assets	Level 1		Level 2		Level 3		December 31, 2016
Derivative embedded conversion feature	$	—	$	—	$	80,651	$	80,651

Summary of Change in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis

The following table shows the change in Level 3 assets and liabilities measured at fair value on a recurring basis for the year ended December 31, 2016 and the six months ended June 30, 2017:

	Derivative asset (liability) embedded conversion feature (in thousands)
Balance, January 1, 2016	$	(120,848	)
Issuance during 2016		—
Unrealized gain on change in fair value		201,499
Balance, December 31, 2016		80,651
Issuance during 2017		—
Unrealized loss on change in fair value		(7,353	)
Balance, June 30, 2017	$	73,298