Description of Business and Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands		6 Months Ended
	Apr. 18, 2017	Jun. 30, 2017	Dec. 31, 2016
Description Of Business And Basis Of Presentation [Line Items]
Proceeds from equity offering, net of expenses		$ 10,457
Working capital		18,800
Cash and cash equivalents, including restricted cash		8,200
Net accounts receivable		9,804	$ 9,784
Private Placement
Description Of Business And Basis Of Presentation [Line Items]
Proceeds from equity offering, gross	$ 10,500	$ 10,500
Payments of stock issuance costs	200
Proceeds from equity offering, net of expenses	$ 10,300