Basis of Presentation - Additional Information (Detail) - USD ($)					9 Months Ended	12 Months Ended
	Aug. 08, 2016	Nov. 07, 2014	Jul. 22, 2014	Feb. 10, 2014	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2014	Dec. 31, 2015
Basis Of Presentation [Line Items]
Proceeds from equity offering, net of expenses	$ 9,500,000	$ 34,800,000	$ 11,500,000	$ 4,800,000		$ 9,520,000	$ 51,118,000
Deemed distribution to preferred shareholders, common stock at fair value						2,184,000
Working capital						16,000,000
Cash and cash equivalents, including restricted cash						9,200,000
Net accounts receivable						$ 9,784,000		$ 8,948,000
Warrants
Basis Of Presentation [Line Items]
Number of warrants to purchase aggregate unregistered shares of common stock	2,035,398	9,205,862
Price per share of unregistered shares of common stock	$ 2.00	$ 4.00
Private Placement
Basis Of Presentation [Line Items]
Aggregate unregistered shares	88,494
Number of warrants to purchase aggregate unregistered shares of common stock	2,035,398	9,205,862
Price per share of unregistered shares of common stock	$ 2.00	$ 4.00
Conversion of stock, each shares issued	100
Stock conversion, price	$ 1.13
Conversion of stock, description						On September 30, 2016, the Company held a meeting of its stockholders and received requisite stockholder approval with respect to the issuance of 8,849,400 shares of common stock upon automatic conversion of the Preferred Stock and the issuance of common stock related exercise of the warrants by certain holders whose warrants were subject to a beneficial ownership limitation.
Conversion of stock, shares issued						8,849,400
Proceeds from equity offering, gross						$ 10,000,000
Proceeds from equity offering, net of expenses		$ 34,800,000				9,500,000
Payments of stock issuance costs		$ 235,000				500,000
Deemed distribution to preferred shareholders, common stock at fair value						1,100,000
Private Placement | Convertible Preferred Stock
Basis Of Presentation [Line Items]
Proceeds from equity offering, gross						8,900,000
Private Placement | Warrants
Basis Of Presentation [Line Items]
Proceeds from equity offering, gross					$ 1,100,000
Private Placement | Beneficial Conversion
Basis Of Presentation [Line Items]
Proceeds from equity offering, gross						$ 1,100,000
Private Placement | Common Stock and Warrants
Basis Of Presentation [Line Items]
Expected term (years)						5 years
Risk-free interest rate						1.03%
Dividend yield						0.00%