Subsequent Event - Additional Information (Detail)	1 Months Ended
	Jul. 26, 2017
Subsequent Event | Series E Convertible Preferred Stock [Member]
Subsequent Event [Line Items]
Preferred Stock, Participation Rights	Pursuant to the agreement, in lieu of the conversion right as provided in the Certificate of Designation of Preferences, Rights and Limitations of the Series E Preferred Stock, each holder has the right to exchange its shares (the “Shares”) of Series E Preferred Stock for shares (the “Exchange Shares”) of the Company’s common stock at an exchange rate so that for each Share, the holder will receive a number of Exchange Shares that would yield net proceeds of $1,350 upon resale of such Exchange Share. Additionally, the holders consented to any Company non-equity linked financing or financing of its interest in INVT SPE subject to certain limitations as provided in the agreement. The holders also agreed to not sell the Exchange Shares in an amount that would exceed the greater of (a) a percentage of the total trading volume on any given day and (b) $500, with an aggregate limit of 25% of total trading volume among all holders. Any sale of Exchange Shares at a price of more than $0.20 per share (the “Break-out Price”) is not subject to the agreement. The Break-out Price may be further reduced if the Company does not meet certain requirements under the agreement.