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Stockholders' Equity and Stock-based Compensation (Details Narrative) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended
Feb. 28, 2019
Mar. 31, 2019
Mar. 31, 2018
Shares issued of common stock, shares   15,000  
Commission expense   $ 75  
Stock-based compensation   $ 713 $ 751
Mayfield Pharmaceuticals, Inc. [Member]      
Number of shares issued for acquisition 1,000,000    
Ownership percentage 72.00%    
2017 Incentive Stock and Awards Plan [Member]      
Maximum number of common stock issuance under the plan   2,000,000  
2017 Plan [Member]      
Number of shares issued   1,146,640  
Restricted Stock [Member]      
Shares issued of common stock, shares   34,090  
Stock Option Plan [Member]      
Closing price of common stock price per share   $ 4.98  
Forfeiture factor, percentage   10.00%  
Unrecognized compensation expense related to unvested stock options granted under the plan   $ 3,513  
Expense expected to recognize over the weighted-average remaining vesting period   1 year 3 months 19 days  
Stock-based compensation   $ 283  
Stock Option Plan [Member] | Employees [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 three months ended March 31, 2019 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.  
Restricted Stock Units [Member]      
Shares issued of common stock, shares   135,000  
Fair market value of restricted shares   $ 851  
Unvested RSUs [Member]      
Unrecognized compensation expense related to unvested stock options granted under the plan   $ 1,900  
Expense expected to recognize over the weighted-average remaining vesting period   3 months 19 days  
Stock-based compensation   $ 430  
Common Stock Warrants [Member]      
Number of shares issued   273,984  
Exercise of warrants, shares   384,000  
Warrants exercise price   $ 1.79  
Common Stock Warrants One [Member]      
Number of shares issued   90,055  
Exercise of warrants, shares   90,055  
Warrants exercise price   $ 1.79  
Number of shares issued, avlue   $ 162