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Stockholders' Equity - Changes in Equity (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance, beginning of period     $ 3,992    
Stock-based compensation     98    
Share repurchases     (1)    
Exercise of stock options     7    
Issuance of stock, net of offering costs     2,921    
Net change on available-for-sale investments     31    
Net loss $ (2,160) $ (3,137) (4,398) $ (6,143) $ (13,300)
Balance, end of period $ 2,650   $ 2,650   $ 3,992