Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands			1 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 10, 2014	Nov. 06, 2012	Apr. 30, 2015	Mar. 31, 2013	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2013	Dec. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Prepaid expenses and other current assets					$ 4,111		$ 4,111			$ 2,914
Total current assets					260,611		260,611			274,481
Other non-current assets					857		857			1,066
Total assets					429,211		429,211			447,411
Long-term debt					140,605		140,605			137,958
Total liabilities and stockholders’ equity					429,211		429,211			447,411
Reimbursement related to research and development expense						$ 0	0	$ 0
Reimbursements Recognized As Reduction To Research And Development Expense						400	0	400
Revenue Recognition [Abstract]
Company milestone-based grant	$ 12,600	$ 8,300
Fund received for research and development activities		$ 2,600
Milestone payments received	$ 10,600		$ 2,400						$ 2,500
Company's expectation to receive milestone payment in 2016					2,800		2,800
Company grant revenue					1,200	$ 700	2,400	$ 1,300
Restricted cash					4,861		4,861			3,127
Deferred grant revenue					$ 6,294		$ 6,294			6,330
Distribution rights [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquisition of distribution rights				$ 800
Distributions rights, contract term				6 years
Scenario, previously reported [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Prepaid expenses and other current assets										3,554
Total current assets										275,121
Other non-current assets										4,565
Total assets										451,550
Long-term debt										142,097
Total liabilities and stockholders’ equity										451,550
New Accounting Pronouncement, Early Adoption, Effect [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Prepaid expenses and other current assets										(640)
Total current assets										(640)
Other non-current assets										(3,499)
Total assets										(4,139)
Long-term debt										(4,139)
Total liabilities and stockholders’ equity										$ (4,139)