Borrowings - Silver Creek Convertible Promissory Notes - Additional Information (Detail) - Convertible Promissory Notes [Member] - USD ($)	1 Months Ended
	May 31, 2016	Dec. 31, 2016
Schedule Of Debt Instruments [Line Items]
Aggregate principal amount	$ 1,000,000
Silver Creek [Member]
Schedule Of Debt Instruments [Line Items]
Aggregate principal amount	$ 1,000,000
Interest rate (as a percent)	6.00%
Debt instrument conversion price per share	$ 1.60
Silver Creek [Member] | Minimum [Member]
Schedule Of Debt Instruments [Line Items]
Minimum gross proceeds for next equity financing conversion	$ 4,000,000
Silver Creek [Member] | Silver Creek Series B Preferred Stock [Member] | Scenario Forecast [Member]
Schedule Of Debt Instruments [Line Items]
Debt instrument conversion price per share		$ 1.35