Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Details Textual)

v3.19.1
Stock-Based Compensation (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Stock-Based Compensation (Textual)      
Issuance of common stock shares   1,085,096  
Unrecognized stock compensation expense $ 456 $ 475  
Number of aggregate intrinsic value of options exercised 7,128 16  
Fair value of options vested $ 45 $ 124  
2018 Equity Incentive Plan [Member]      
Stock-Based Compensation (Textual)      
Common stock are available for sale and reserved for issuance 3,001,620   2,729,416
Issuance of common stock shares 2,077,555    
Number of common stock, description (i) 10% of the post-closing outstanding shares of common stock; (ii) 5% of the outstanding shares of common stock on the last day of the immediately preceding fiscal year; or (iii) such other amount as our board of directors may determine.    
2009 Equity Incentive Plan [Member]      
Stock-Based Compensation (Textual)      
Unvested shares   33,102 40,707
Accrued expenses   $ 30 $ 34
2018 Employee Stock Purchase Plan [Member]      
Stock-Based Compensation (Textual)      
Common stock are available for sale and reserved for issuance 1,228,237   1,228,237
Description of reverse merger and recapitalization Subject to certain other limitations or unless otherwise determined by the administrator, a participant may purchase a maximum of 2,000 shares of common stock during a purchase period. The offering periods under the 2018 ESPP will begin on such date as determined by the administrator and expire on the earliest to occur of (a) the completion of the purchase of shares on the last exercise date occurring within 27 months of the applicable enrollment date of the offering period on which the purchase right was granted, or (b) a shorter period established by the administrator prior to an enrollment date for all options to be granted on such enrollment date. Amounts deducted and accumulated by the participant are used to purchase shares of common stock on each exercise date. The purchase price of the shares will be determined by the administrator but in no event will be less than 85% of the lower of the fair market value of common stock on the enrollment date or on the exercise date. Participants may end their participation at any time during an offering period and will be paid their accrued contributions that have not yet been used to purchase shares of common stock. Participation ends automatically upon termination of employment with the Company.    
Number of common stock, description (i) 3% of the expected post-closing outstanding shares of common stock; (ii) 1.5% of the outstanding shares of common stock on the last day of the immediately preceding fiscal year; or such other amount as the administrator may determine. As of March 31, 2019, the Company has not consummated an enrollment or offering period related to the 2018 ESPP, and 1,228,237 shares of common stock are available for sale under the 2018 ESPP.