Merger Agreement and Related Matters - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 25, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Minimum [Member] | Amended Loan Agreement [Member] | CIBC [Member]
Business Acquisition [Line Items]
Debt instrument required liquidity	$ 2,000
Series B Convertible Preferred Stock [Member]
Business Acquisition [Line Items]
Convertible preferred stock interest rate		7.00%	7.00%	7.00%	7.00%	7.00%
Nice Acquisition Sub, Inc [Member]
Business Acquisition [Line Items]
Termination Fee Payable	$ 4,454
Nice Acquisition Sub, Inc [Member] | Restricted Stock [Member]
Business Acquisition [Line Items]
Restricted stock award consideration description				In connection with the Merger, (i) each vested company restricted stock award outstanding, and each unvested company restricted stock award outstanding under the Company Stock Plan (each, a Restricted Stock Award and collectively, the Restricted Stock Awards) held by a holder holding less, in the aggregate, than 2,000 shares of Common Stock subject to such Restricted Stock Awards, will be cancelled and converted into a right to receive an amount in cash, without interest, equal to (x) the amount of the Common Offer Price multiplied by (y) the total number of shares of Common Stock subject to such award and (ii) with respect to each unvested Restricted Stock Award held by a holder holding, in the aggregate, 2,000 or more shares of Common Stock subject to such unvested Restricted Stock Awards (x) 2,000 shares of Common Stock subject to such unvested Restricted Stock Awards shall be cancelled and converted into the right to receive cash in an amount per share equal to the Common Offer Price and (y) the remaining shares subject to such unvested Restricted Stock Awards shall be assumed by Parent and converted into shares of restricted Guarantor American Depositary Shares (as defined in the Merger Agreement) (collectively, the Restricted Stock Award Consideration).
Nice Acquisition Sub, Inc [Member] | Restricted Stock [Member] | Maximum [Member]
Business Acquisition [Line Items]
Aggregate number of shares of common stock held by holder	2,000
Nice Acquisition Sub, Inc [Member] | Series B Convertible Preferred Stock [Member]
Business Acquisition [Line Items]
Convertible preferred stock interest rate	7.00%
Nice Acquisition Sub, Inc [Member] | Series B Convertible Preferred Stock [Member] | Common Stock [Member]
Business Acquisition [Line Items]
Acquisition price per share	$ 2.70
Nice Acquisition Sub, Inc [Member] | Series B Convertible Preferred Stock [Member] | Preferred Stock [Member]
Business Acquisition [Line Items]
Acquisition price per share	$ 7.80