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Subsequent Events (Details Textual) - Subsequent Event [Member] | Aug. 03, 2018 USD ($) | Aug. 07, 2018 shares | Aug. 03, 2018 EUR (€)
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Subsequent Event [Line Items] |  |  |
Amount Received Under Amendment To Purchase Agreement | $ 1,109,000 |  | € 950,000
Convertible Debt | $ 642,000 |  | € 550,000
Long-term Purchase Commitment, Milestones | On August 3, 2018, we entered into an amendment (the “Amendment”) to the Purchase Agreement with Molteni. Under the Amendment, Molteni made an immediate payment to us of €950,000 (approximately $1,109,000) and has committed to make a convertible loan to us of €550,000 (approximately $642,000) provided we have submitted our response to the 120-day letter from the EMA on or prior to September 14, 2018 in accordance with the Amendment, both in exchange for the elimination of an aggregate of €2.0 million (approximately $2,335,000) of regulatory milestones provided for in the Purchase Agreement that are potentially payable in 2019, at the earliest. |  |
2015 Omnibus Equity Incentive Plan [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Common Stock, Shares Authorized |  | 2,500,000 |
Maximum [Member] | 2015 Omnibus Equity Incentive Plan [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Common Stock, Shares Authorized |  | 3,500,000 |
Convertible Debt [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Debt Instrument, Interest Rate Terms | In the event the EMA has not granted marketing approval by December 31, 2019, the Convertible Loan will become due and payable, together with accrued interest at the rate of one-month LIBOR (to the extent in excess of 1.10%) plus 9.50% per annum. |  |

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