Quarterly report pursuant to Section 13 or 15(d)

Accrued Expenses - Schedule of Accrued Expenses (Detail)

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Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($)
Jun. 30, 2015
Dec. 31, 2014
Accrued expenses    
Accrued compensation expense $ 333,979 $ 332,892
Accrued audit and tax expenses 148,500 403,450
Other accrued expenses 153,082 7,523
Total accrued expenses, current 635,561 743,865
Accrued expenses non-current    
Reserve for litigation TUM 302,273 327,937
Accrued expenses restoration 5,577 6,051
Total accrued expenses, non-current 307,850 333,988
Total accrued expenses $ 943,411 $ 1,077,853