Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets

Intangible asset balances as of September 30, 2017 and December 31, 2016 were as follows (in thousands):

	September 30, 2017
	Gross Carrying Value		Accumulated Amortization			Net Carrying Value
Developed technology - JUXTAPID	$	42,300	$	(3,279	)	$	39,021
Developed technology - MYALEPT	210,158		(17,633		)	192,525
Total intangible assets	$	252,458	$	(20,912	)	$	231,546

	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 September 30, 2017, the estimated amortization expense of purchased intangibles for future periods is as follows (in thousands): 

Years Ending December 31,	Amount
2017 (remaining 3 months)	$	6,275
2018	25,096
2019	25,096
2020	25,096
2021 and thereafter	149,983
Total intangible assets subject to amortization	$	231,546