Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets

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

	June 30, 2017
	Gross Carrying Value		Accumulated Amortization			Net Carrying Value
Developed technology - JUXTAPID	$	42,300	$	(2,295	)	$	40,005
Developed technology - MYALEPT	210,158		(12,343		)	197,815
Total intangible assets	$	252,458	$	(14,638	)	$	237,820

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

Years Ending December 31,	Amount
2017 (remaining 6 months)	$	12,549
2018	25,096
2019	25,096
2020	25,096
2021 and thereafter	149,983
Total intangible assets subject to amortization	$	237,820