Stock-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Number of Shares
Outstanding at beginning of period (in shares)	35,817.010
Granted (in shares)	6,121.000
Shares sold	0.000
Forfeited or expired (in shares)	13,646.592
Outstanding at end of period (in shares)	28,291.418	35,817.010
Exercisable, Number of Shares	0.000
Weighted Average Exercise Price Per Share
Outstanding at beginning of period (in usd per share)	$ 1,000
Granted (in usd per share)	1,000
Forfeited or expired (in usd per share)	1,000
Outstanding at end of period (in usd per share)	1,000	$ 1,000
Exercisable, Weighted Average Exercise Price Per Share (in usd per share)	$ 0
Outstanding, Weighted Average Remaining Contractual Term (Years)	9 years 1 month 30 days	9 years 6 months
Exercisable, Weighted Average Remaining Contractual Term (Years)
Outstanding, Aggregate Intrinsic Value	$ 0
Exercisable, Aggregate Intrinsic Value	$ 0