Goodwill And Intangible Assets, Net - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite Lived Intangible Assets [Line Items]
Intangible asset Impairments	$ 80	$ 394
Weighted-average useful life of intangible assets	7 years 6 months 21 days
Amortization expense of intangible assets	$ 1,600	800	$ 400
Research and Development Expenses
Finite Lived Intangible Assets [Line Items]
Intangible asset Impairments	100
CDE In- Process Research and Development
Finite Lived Intangible Assets [Line Items]
Intangible asset Impairments	80	248
Licensing Agreements | Research and Development Expenses
Finite Lived Intangible Assets [Line Items]
Intangible asset Impairments		200
Licensing Agreements | Selling, General, and Administrative Expenses
Finite Lived Intangible Assets [Line Items]
Intangible asset Impairments		100
Licensing Agreements | Hanmi Pharmaceuticals Co. Ltd.
Finite Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 400
Acquired finite-lived intangible assets, amortization period	12 years 9 months
Licensing Agreements | Gland Pharma Ltd
Finite Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 4,300
Acquired finite-lived intangible assets, amortization period	5 years
Customer Lists | QuaDPharma
Finite Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets, amortization period	7 years
Customer Lists | Polymed
Finite Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets, amortization period	6 years
Technology | Polymed
Finite Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets, amortization period	12 years
Quad Pharma Customer List
Finite Lived Intangible Assets [Line Items]
Finite-lived intangible asset, Impairments		$ 146