Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Mar. 31, 2013
Deferred Tax Assets Liabilities [Line Items]
Tax benefit recognized	$ 0	$ 0
Federal research tax credit				549,000
Valuation allowance, deferred tax assets	20,194,000	20,194,000
Deferred tax assets valuation allowance increase			10,241,000
Forecast [Member]
Deferred Tax Assets Liabilities [Line Items]
Expected cash refunds to be generated	$ 1,600,000	$ 1,600,000