Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets

Intangible asset balances as of March 31, 2017 and December 31, 2016 were as follows (in thousands):

	March 31, 2017
	Gross Carrying Value		Accumulated Amortization			Net Carrying Value
Developed technology - Juxtapid	$	42,300	$	(1,312	)	$	40,988
Developed technology - Myalept	210,158		(7,053		)	203,105
Total intangible assets	$	252,458	$	(8,365	)	$	244,093

	December 31, 2016
	Gross Carrying Value		Accumulated Amortization			Net Carrying Value
Developed technology - Juxtapid	$	42,300	$	(328	)	$	41,972
Developed technology - Myalept	210,158		(1,806		)	208,352
Total intangible assets	$	252,458	$	(2,134	)	$	250,324

Estimated Future Amortization Expense of Acquired Intangibles

At March 31, 2017, the estimated amortization expense of purchased intangibles for future periods is as follows (in thousands): 

Years Ending December 31,	Amount
2017 (remaining 9 months)	$	18,822
2018	25,096
2019	25,096
2020	25,096
2021 and thereafter	149,983
Total intangible assets subject to amortization	$	244,093