Annual report pursuant to Section 13 and 15(d)

Debt Agreements (Details Textual)

v3.19.1
Debt Agreements (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Feb. 02, 2018
Mar. 21, 2018
Jul. 27, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Sep. 25, 2018
Class of Warrant or Right, Exercise Price of Warrants or Rights       $ 7.20      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights       90,000      
Revenue from Contract with Customer, Including Assessed Tax       $ 535,000 $ 0 $ 0  
Horizon Technology Finance Corporation [Member]              
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 11.76        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights     46,770        
Class Of Warrant Or Right Terms     18 months        
Venture Loan [Member]              
Debt Instrument Final Payment On Each Loan Tranchepercentage     5.00%        
Early Repayment of Subordinated Debt $ 3.0            
Long-term Debt $ 7,000,000            
Venture Loan [Member] | Horizon Technology Finance Corporation [Member]              
Debt Instrument, Face Amount     $ 7.0        
Debt Instrument, Maturity Date     Dec. 31, 2018        
Debt Instrument, Term     46 months        
Debt Instrument, Description of Variable Rate Basis     one-month LIBOR (floor of 1.10%) plus 8.40%        
Debt Instrument, Payment Terms     In addition, if we repay all or a portion of the loan prior to the applicable maturity date, we will pay Horizon a prepayment penalty fee, based on a percentage of the then outstanding principal balance, equal to 4% if the prepayment occurs during the interest-only payment period, 3% if the prepayment occurs during the 12 months following such period, and 2% thereafter.        
Debt Instrument, Debt Default, Description of Violation or Event of Default     default interest rate of an additional 5% may be applied to the outstanding loan balances        
Debt Instrument Additional Face Amount     $ 3.0        
Molteni Loan [Member]              
Long-term Debt   $ 2,400,000          
Conversion Of Debt To Equity Description   In addition, Molteni has the right to convert its portion of the debt into shares of our common stock at a conversion price of $7.20 per share and is required to effect this conversion of debt to equity if we complete an equity financing resulting in gross proceeds of at least $10.0 million at a price per share of common stock in excess of $7.20 and repay the $1.6 million balance of Horizon’s loan amount.          
Proceeds from Subordinated Short-term Debt   $ 4,000,000          
Minimum [Member] | Horizon Technology Finance Corporation [Member]              
Capitalization, Long-term Debt and Equity     50,000,000        
Minimum [Member] | Horizon Technology Finance Corporation [Member] | Royalty [Member]              
Revenue from Contract with Customer, Including Assessed Tax     750,000        
Minimum [Member] | Venture Loan [Member] | Horizon Technology Finance Corporation [Member]              
Debt Instrument Additional Face Amount     $ 10,000,000        
New Horizon Warrants [Member]              
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 7.20         $ 1.50
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   6,667         366,668