Stock-Based Compensation - Common Stock Option and Restricted Stock Award Activity (Detail) (USD $)	6 Months Ended	9 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Available for Grant, Beginning of year	1,286,647	0	[1]
Shares Available For Grant, Authorized	706,950	2,898,495
Shares Available For Grant, Options Granted	(902,298)	(1,293,720)
Shares Available For Grant, Options assumed In Merger	(15,000)
Shares Available For Grant, Restricted Awards Granted	(19,088)	(318,128)
Shares Available For Grant, Restricted Awards Vested	0
Shares Available for Grant, End of year	1,057,211	1,286,647
Number of Shares, Beginning of Year	1,611,848	0	[1]
Number of Shares, Authorized	0	0
Number of Shares, Options Granted	902,298	1,293,720
Number of Shares, Options assumed In Merger	15,000
Number of Shares, Restricted Awards Granted	19,088	318,128
Number of Shares, Restricted Awards Vested	(19,088)
Number of Shares, End of Year	2,529,146	1,611,848
Number of Shares, Total vested and expected to vest shares (options)	2,211,018
Weighted Average Exercise Price Per share, Beginning of year		$ 0	[1]
Weighted Average Exercise Price Per Share, Authorized	$ 0	$ 0
Weighted Average Exercise Price Per Share, Options Granted	$ 3.37	$ 2.27
Weighted Average Exercise Price Per Share, Options assumed in Merger	$ 14.30
Weighted Average Exercise Price Per Share, Restricted Awards Vested	$ 3.04
Weighted Average Exercise Price Per Share, Total vested and expected to vest shares (options)	$ 2.73

[1] Options and RSAs granted prior to the adoption of the plan were subsumed under the plan once it was adopted.