Asset Acquisition and License Agreements - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2019	Sep. 30, 2018
Asset Acquisition [Line Items]
Impairment charge of intangible asset				$ 3,151	$ 0
SRX Cardio
Asset Acquisition [Line Items]
Variable interest entity, Upfront payment	$ 500
Gain on de-recognition of contingent milestone payable			$ 2,300
Loss from deconsolidation		$ 76
SRX Cardio | In-process Research and Development
Asset Acquisition [Line Items]
Impairment charge of intangible asset			$ 3,200