Stock-Based Compensation - Summary of Option Activity (Detail) - $ / shares	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shares, Outstanding, Beginning balance	1,075,000
Shares, Granted	0	0
Shares, Outstanding, Ending balance	1,075,000		1,075,000
Shares, Vested and expected to vest	1,060,000
Shares, Exercisable	976,000
Wtd. Avg. Exercise Price, Outstanding, Beginning balance	$ 1.04
Wtd. Avg. Exercise Price, Outstanding, Ending balance	1.04		$ 1.04
Wtd. Avg. Exercise Price, Vested and expected to vest	1.03
Wtd. Avg. Exercise Price, Exercisable	$ 0.99
Wtd. Avg. Remaining Contractual Life, Outstanding	3 years 6 months 29 days		3 years 9 months 26 days
Wtd. Avg. Remaining Contractual Life, Vested and expected to vest	3 years 6 months 18 days
Wtd. Avg. Remaining Contractual Life, Exercisable	3 years 4 months 10 days