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Stockholders' Equity and Stock-based Compensation (Details Narrative) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Feb. 28, 2018
Mar. 31, 2018
Jan. 31, 2018
Nov. 30, 2015
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Shares issued of restricted common stock, shares   35,427 25,273        
Accrued royalty expense   $ 64 $ 44        
Proceeds from exercise of warrants           $ 2,643 $ 179
Stock-based compensation           $ 1,950 $ 2,265
2017 Incentive Stock and Awards Plan [Member]              
Maximum number of common stock issuance under the plan         2,000,000 2,000,000  
Common Stock Warrants [Member]              
Warrants exercise price         $ 1.79 $ 1.79  
Common Stock Warrant One [Member]              
Number of shares issued           130,122  
Warrants exercise price         $ 1.79 $ 1.79  
Number of warrants exercised           321,945  
Consultants Employees and Directors [Member]              
Stock-based compensation           $ 17  
Restricted Stock Units [Member]              
Shares issued of restricted common stock, shares           65,536  
Restricted Stock Units [Member] | Andrew R. Boll [Member]              
Shares issued of restricted common stock, shares 30,000            
Restricted Stock Units [Member] | John P. Saharek [Member]              
Shares issued of restricted common stock, shares 30,000            
Restricted Stock Units [Member] | Board of Directors [Member]              
Shares issued of restricted common stock, shares         136,360 136,360  
Fair market value of restricted shares         $ 300 $ 300  
Stock Option Plan [Member]              
Closing price of common stock price per share         $ 2.78 $ 2.78  
Stock options granted with exercise price contractual terms           6 years 2 months 19 days  
Forfeiture factor, percentage           10.00%  
Unrecognized compensation expense related to unvested stock options granted under the plan         $ 2,139 $ 2,139  
Expense expected to recognize over the weighted-average remaining vesting period           2 years 2 months 12 days  
Stock-based compensation         291 $ 1,063  
Stock Option Plan [Member] | Employees and Consultants [Member]              
Stock options granted with exercise price contractual terms           10 years  
Stock options granted vesting terms           Vesting terms for options granted to employees and consultants during the nine months ended September 30, 2018 typically included one of the following vesting schedules: 25% of the shares subject to the option vest and become exercisable on the first anniversary of the grant date and the remaining 75% of the shares subject to the option vest and become exercisable quarterly in equal installments thereafter over three years; and 100% of the shares subject to the option vest on a quarterly basis in equal installments over three years. Certain option awards provide for accelerated vesting if there is a change in control (as defined in the Plan) and in the event of certain modifications to the option award agreement.  
Unvested RSUs [Member]              
Unrecognized compensation expense related to unvested stock options granted under the plan         756 $ 756  
Expense expected to recognize over the weighted-average remaining vesting period           6 months  
Stock-based compensation         $ 293 $ 870  
Sales Agreement [Member]              
Number of shares sold under the agreement           305,619  
Proceeds from sale of common stock approximately           $ 642  
Sales commission and offering expenses           20  
Available future sales           $ 7,378  
Cantor Fitzgerald & Co [Member] | Sales Agreement [Member]              
Cash commission, percentage       3.00%