Commitments and Contingencies (Details 2)		1 Months Ended	3 Months Ended
	Jun. 26, 2014 EUR (€) item shares	May. 31, 2015 EUR (€)	Mar. 31, 2015 USD ($)	Sep. 30, 2013 USD ($) item	Dec. 31, 2015 EUR (€)	Jun. 30, 2015 EUR (€)	Apr. 30, 2015 EUR (€)	Mar. 31, 2015 EUR (€)	Mar. 31, 2015 USD ($) $ / shares	Mar. 25, 2015 EUR (€)	Aug. 31, 2014 $ / shares
Commitments and Contingencies
Minimum lease payments | $									$ 63,795
Gross aggregate proceeds | $			$ 250,000
Exercise price (in dollars per share) | $ / shares											$ 6.40
Convertible promissory notes
Commitments and Contingencies
Gross aggregate proceeds | $				$ 525,000
Interest rate (as a percent)				8.00%
Number of Convertible Promissory Notes Issued | item				4
Debt Instrument Number of Business Days After Date of Consummation of Initial Closing of First Equity Round of Financing when Debt Instrument Is Due				10 days
Transfer Agreement | Manufacturer
Commitments and Contingencies
Prepayment of start-up fee	€ 500,000
Prepayment of start-up fee which is to be paid at the earlier to occur of September 15, 2014 or the closing date of an initial public offering	250,000
Prepayment of start-up fee which is to be paid at the time of installation and qualification of the Company's equipment	250,000
Prepayment related to technology transfer	620,000									€ 310,000
Prepayment related to technology transfer which is to be paid within five days of the signature of the Transfer Agreement	310,000
Prepayment related to technology transfer which is to be paid after the delivery of a final study report	310,000
Prepayment for design of a portion of the Manufacturer's facility which is to be paid within five days of the signature of the Transfer Agreement	€ 100,000
Increase in prepayment for design of portion of manufacturer facility payable within specified days of signature of agreement										170,000
Period within which prepayment for design of a portion of the Manufacturer's facility is payable from signature of the Transfer Agreement	5 days
Bonus fee payable	€ 300,000									€ 300,000
Number of installments | item	2
Aggregate amount payable to Manufacturer upon the delivery of agreed-upon levels of satisfactory product pursuant to the agreement	€ 500,000							€ 250,000
Number of warrants issued to purchase shares of common stock (in shares) | shares	16,666
Exercise price as a percentage of initial public offering price	90.00%
Exercise price (in dollars per share) | $ / shares									$ 6.30
Transfer Agreement | Manufacturer | Subsequent event
Commitments and Contingencies
Prepayment related to technology transfer		€ 215,000
Prepayment Of StartUp Fee		500,000
Bonus fee paid		€ 150,000
Transfer Agreement | Manufacturer | Scenario, Forecast
Commitments and Contingencies
Prepayment of start-up fee							€ 500,000
Prepayment related to technology transfer which is to be paid within five days of the signature of the Transfer Agreement						€ 95,000	215,000
Prepayment for design of a portion of the Manufacturer's facility which is to be paid within five days of the signature of the Transfer Agreement						20,000	150,000
Bonus fee payable due within specified number of days of signature agreement					€ 150,000		€ 150,000
Aggregate amount payable to Manufacturer upon the delivery of agreed-upon levels of satisfactory product pursuant to the agreement						€ 250,000