Equity - Summary of Warrant Activity (Detail) - Warrant [Member]	6 Months Ended
	Jun. 30, 2017 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants outstanding, beginning balance | shares	450,000
Warrants, granted | shares	0
Warrants, exercised | shares	450,000
Warrants, canceled or expired | shares	0
Warrants outstanding, ending balance | shares	0
Warrants exercisable, ending balance | shares	0
Weighted average exercise price, warrants outstanding, beginning balance | $ / shares	$ 1.50
Weighted average exercise price, warrants granted | $ / shares	0
Weighted average exercise price, warrants exercised | $ / shares	1.50
Weighted average exercise price, warrants canceled or expired | $ / shares	0
Weighted average exercise price, warrants outstanding, ending balance | $ / shares	0
Weighted average exercise price, warrants exercisable, ending balance | $ / shares	$ 0