Share-Based Compensation - Additional Information (Detail) - USD ($)		1 Months Ended			6 Months Ended		12 Months Ended
	Jan. 16, 2015	Sep. 17, 2014	Aug. 27, 2008	Aug. 19, 1999	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Sep. 10, 2004
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share based compensation expense	$ 3,000,000				$ 77,000	$ 18,000
Issuance of stock option to purchase stock					6,000,000
Common stock reserved for issuance					4,410,864
Stock option awards vesting period					2 years
Unrecognized compensation cost related to bon-vested					$ 70,000
Intrinsic value of options exercised							$ 793,000
Maximum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation arrangement by share based payment award options granted contractual term					10 years
Minimum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation arrangement by share based payment award options granted contractual term					3 years
2004 Stock Incentive Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Common stock reserved for issuance								2,500,000
2008 Stock Incentive Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Common stock reserved for issuance			3,000,000
Share based compensation arrangement by share based payment award percentage of fair market Person holding more then 10% voting stock			110.00%
2014 Stock Incentive Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Common stock reserved for issuance		3,000,000
Share based compensation arrangement by share based payment award percentage of fair market Person holding more then 10% voting stock		110.00%
Stock Option Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Options granted					70,000	10,000	1,055,500
2014 Stock Incentive Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Plan expiration date		Sep. 17, 2024
2014 Stock Incentive Plan | Maximum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Expiration period of option awards		10 years
2014 Stock Incentive Plan | Minimum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Expiration period of option awards		5 years
2008 Stock Incentive Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Plan expiration date			Aug. 27, 2018
2008 Stock Incentive Plan | Maximum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Expiration period of option awards			10 years
2008 Stock Incentive Plan | Minimum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Expiration period of option awards			5 years
1997 Employee Stock Option Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Common stock reserved for issuance				2,000,000
Plan expiration date				Jun. 11, 2007