Borrowings - Convertible Notes - Silver Creek - Additional Information (Detail) - Silver Creek [Member] - USD ($)	1 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015
Schedule Of Debt Instruments [Line Items]
Ownership interest (as a percent)	74.00%	60.00%	64.00%
Non-controlling interest		$ 400,000	$ 800,000
Silver Creek Convertible Note [Member]
Schedule Of Debt Instruments [Line Items]
Gross proceeds from the debt issuance	$ 1,600,000	$ 1,000,000	$ 900,000
Interest rate (as a percent)				6.00%
Discount on automatic conversion into the next qualifying equity financing (as a percent)	25.00%
Derivative liability	$ 200,000
Silver Creek Convertible Note [Member] | Minimum [Member]
Schedule Of Debt Instruments [Line Items]
Amount of gross proceeds from qualifying equity financing in which holders would automatically convert into the next qualifying equity financing at a 25% discount	$ 4,000,000