Organization - Additional Information (Detail) $ in Thousands		12 Months Ended
	Sep. 25, 2015	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Reverse stock split, Conversion Ratio	0.143
Reverse stock split, description		On September 25, 2015, the Company effected a 1-for-7 reverse stock split of its issued and outstanding Class A common stock and Class B common stock.
Secured project related notes, maturing during the remainder of 2016		$ 21,700
Notes payable to affiliates		$ 15,866	$ 19,028
Notes payable maturity		2017