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The Company and Basis of Presentation (IPO and Capital Requirements) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Feb. 12, 2018
Sep. 08, 2016
Aug. 04, 2016
Mar. 31, 2018
Mar. 31, 2017
Sale of Stock          
Issuance of stock (in shares)       3,592,858  
Other offering expenses       $ 1,949 $ 1,072
IPO          
Sale of Stock          
Issuance of stock (in shares)     3,000,000    
Share price (in dollars per share)     $ 10.00    
Net proceeds     $ 26,100    
Underwriting discounts and commissions     2,100    
Other offering expenses     $ 2,100    
Overallotment          
Sale of Stock          
Issuance of stock (in shares) 450,000 27,755      
Share price (in dollars per share)   $ 10.00