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CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) - USD ($)
$ in Thousands
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Total
Balance at beginning at Dec. 31, 2017 $ 4 $ 4,001 $ (2) $ (57,525) $ (53,522)
Balance at beginning (in shares) at Dec. 31, 2017 3,970,586        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Unrealized gain on marketable securities     1   1
Equity-based compensation expense   482     482
Net loss       (8,892) (8,892)
Balance at end at Mar. 31, 2018 $ 4 4,483 (1) (66,417) (61,931)
Balance at end (in shares) at Mar. 31, 2018 3,970,586        
Balance at beginning at Dec. 31, 2017 $ 4 4,001 (2) (57,525) (53,522)
Balance at beginning (in shares) at Dec. 31, 2017 3,970,586        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Unrealized gain on marketable securities         2
Net loss         (23,599)
Balance at end at Jun. 30, 2018 $ 25 192,711   (81,124) 111,612
Balance at end (in shares) at Jun. 30, 2018 25,243,684        
Balance at beginning at Mar. 31, 2018 $ 4 4,483 (1) (66,417) (61,931)
Balance at beginning (in shares) at Mar. 31, 2018 3,970,586        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Unrealized gain on marketable securities         2
Restricted shares forfeited during the period (in shares) (852)        
Equity-based compensation expense   1,089     1,089
Sale of common shares $ 6 77,829     $ 77,835
Sale of common shares (in shares) 6,164,000       6,164,000
Unrealized gain on marketable securities     1   $ 1
Reclassification of warrant to stockholders' equity   93     93
Conversion of convertible preferred stock into common stock $ 15 109,217     109,232
Conversion of convertible preferred stock into common stock (in shares) 15,109,950        
Net loss       (14,707) (14,707)
Balance at end at Jun. 30, 2018 $ 25 192,711   (81,124) 111,612
Balance at end (in shares) at Jun. 30, 2018 25,243,684        
Balance at beginning at Dec. 31, 2018 $ 26 213,453 (8) (106,848) 106,623
Balance at beginning (in shares) at Dec. 31, 2018 26,217,701        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Unrealized gain on marketable securities     24   24
Restricted shares forfeited during the period (in shares) (2,237)        
Exercise of stock options   13     13
Exercise of stock options (in shares) 1,983        
Equity-based compensation expense   1,618     1,618
Net loss       (10,755) (10,755)
Balance at end at Mar. 31, 2019 $ 26 215,084 16 (117,603) 97,523
Balance at end (in shares) at Mar. 31, 2019 26,217,447        
Balance at beginning at Dec. 31, 2018 $ 26 213,453 (8) (106,848) 106,623
Balance at beginning (in shares) at Dec. 31, 2018 26,217,701        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Unrealized gain on marketable securities         66
Net loss         (23,280)
Balance at end at Jun. 30, 2019 $ 29 258,996 58 (130,128) 128,955
Balance at end (in shares) at Jun. 30, 2019 29,230,330        
Balance at beginning at Mar. 31, 2019 $ 26 215,084 16 (117,603) 97,523
Balance at beginning (in shares) at Mar. 31, 2019 26,217,447        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Unrealized gain on marketable securities     42   42
Exercise of stock options   79     79
Exercise of stock options (in shares) 12,883        
Equity-based compensation expense   1,814     1,814
Sale of common shares $ 3 42,019     42,022
Sale of common shares (in shares) 3,000,000        
Net loss       (12,525) (12,525)
Balance at end at Jun. 30, 2019 $ 29 $ 258,996 $ 58 $ (130,128) $ 128,955
Balance at end (in shares) at Jun. 30, 2019 29,230,330