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Condensed Consolidated Statements of Stockholders' Equity (Deficit) (Unaudited) - USD ($)
$ in Thousands
February 2018 Offering [Member]
Common Stock [Member]
February 2018 Offering [Member]
Additional Paid-in Capital [Member]
February 2018 Offering [Member]
November 2017 ATM Facility [Member]
Common Stock [Member]
November 2017 ATM Facility [Member]
Additional Paid-in Capital [Member]
November 2017 ATM Facility [Member]
Retained Earnings [Member]
November 2017 ATM Facility [Member]
August 2019 ATM Facility [Member]
Common Stock [Member]
August 2019 ATM Facility [Member]
Additional Paid-in Capital [Member]
August 2019 ATM Facility [Member]
Retained Earnings [Member]
August 2019 ATM Facility [Member]
Consultant [Member]
Common Stock [Member]
Consultant [Member]
Additional Paid-in Capital [Member]
Consultant [Member]
Retained Earnings [Member]
Consultant [Member]
Director [Member]
Common Stock [Member]
Director [Member]
Additional Paid-in Capital [Member]
Director [Member]
Retained Earnings [Member]
Director [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Total
Balances (in shares) at Dec. 31, 2017                                       195,033      
Balances at Dec. 31, 2017                                       $ 102,981 $ (105,581) $ (2,600)
Stock-based compensation expense                                         645   645
Issuance of common shares from employee stock purchase plan (in shares)                                       207      
Issuance of common shares from employee stock purchase plan                                         65   65
Issuance of restricted shares (in shares)                                       221      
Issuance of restricted shares                                         108   108
Net loss                                           (12,669) (12,669)
Stock offering, net of issuance costs (in shares) 115,000     2,082                                      
Stock offering, net of issuance costs $ 32,225 $ 32,225   $ 1,011   $ 1,011                                
Cumulative effect adjustment from adoption of new accounting standard – ASC 606                                         177 177
Balances (in shares) at Mar. 31, 2018                                       312,543      
Balances at Mar. 31, 2018                                       137,035 (118,073) 18,962
Balances (in shares) at Dec. 31, 2017                                       195,033      
Balances at Dec. 31, 2017                                       102,981 (105,581) (2,600)
Net loss                                             (36,489)
Stock offering, net of issuance costs (in shares)             2,771                                
Balances (in shares) at Sep. 30, 2018                                       315,226      
Balances at Sep. 30, 2018                                       139,126 (141,893) (2,767)
Balances (in shares) at Mar. 31, 2018                                       312,543      
Balances at Mar. 31, 2018                                       137,035 (118,073) 18,962
Stock-based compensation expense                                       709 709
Issuance of common shares from employee stock purchase plan (in shares)                                       256      
Issuance of common shares from employee stock purchase plan                                       59 59
Issuance of restricted shares (in shares)                                       208      
Issuance of restricted shares                                       67 67
Issuance of common shares in connection with restricted stock award to employee (in shares)                                       1,000      
Issuance of common shares in connection with restricted stock award to employee                                       256 256
Net loss                                       (11,516) (11,516)
Stock offering, net of issuance costs (in shares)       652                                      
Stock offering, net of issuance costs       171 $ 171                                
February 2018 Offering issuance costs                                       (11) (11)
Balances (in shares) at Jun. 30, 2018                                       314,659      
Balances at Jun. 30, 2018                                       138,286 (129,589) 8,697
Stock-based compensation expense                                       698 698
Issuance of common shares from employee stock purchase plan (in shares)                                       286      
Issuance of common shares from employee stock purchase plan                                       64 64
Issuance of restricted shares (in shares)                                       182      
Issuance of restricted shares                                       47 47
Issuance of common shares in connection with restricted stock award to employee (in shares)                                       62      
Issuance of common shares in connection with restricted stock award to employee                                       20 20
Net loss                                       (12,304) (12,304)
Stock offering, net of issuance costs (in shares)       37     37                                
Stock offering, net of issuance costs       $ 11 $ 11                                
Balances (in shares) at Sep. 30, 2018                                       315,226      
Balances at Sep. 30, 2018                                       139,126 (141,893) (2,767)
Balances (in shares) at Dec. 31, 2018                                       463,630      
Balances at Dec. 31, 2018                                       160,297 (155,385) 4,912 [1]
Stock-based compensation expense                                         470   470
Issuance of common shares from employee stock purchase plan (in shares)                                       429      
Issuance of common shares from employee stock purchase plan                                         35   35
Issuance of restricted shares (in shares)                       274                      
Issuance of restricted shares                         $ 25   $ 25                
Issuance of common shares in connection with restricted stock award to employee (in shares)                                       6      
Issuance of common shares in connection with restricted stock award to employee                                         1   1
Net loss                                           (10,029) (10,029)
Balances (in shares) at Mar. 31, 2019                                       464,339      
Balances at Mar. 31, 2019                                       160,828 (165,414) (4,586)
Balances (in shares) at Dec. 31, 2018                                       463,630      
Balances at Dec. 31, 2018                                       160,297 (155,385) 4,912 [1]
Net loss                                             (27,709)
Stock offering, net of issuance costs (in shares)             0                                
Balances (in shares) at Sep. 30, 2019                                       1,469,789      
Balances at Sep. 30, 2019                                       168,304 (183,094) (14,790)
Balances (in shares) at Mar. 31, 2019                                       464,339      
Balances at Mar. 31, 2019                                       160,828 (165,414) (4,586)
Stock-based compensation expense                                       562 562
Issuance of common shares from employee stock purchase plan (in shares)                                       602      
Issuance of common shares from employee stock purchase plan                                       20 20
Issuance of restricted shares (in shares)                       250       527              
Issuance of restricted shares                       $ 11 $ 11 $ 48 $ 48        
Issuance of common shares in connection with restricted stock award to employee (in shares)                                       6      
Issuance of common shares in connection with restricted stock award to employee                                      
Net loss                                       (9,724) (9,724)
Balances (in shares) at Jun. 30, 2019                                       465,724      
Balances at Jun. 30, 2019                                       161,469 (175,138) (13,669)
Stock-based compensation expense                                       503 503
Issuance of common shares from employee stock purchase plan (in shares)                                       200      
Issuance of common shares from employee stock purchase plan                                       1 1
Issuance of restricted shares (in shares)                                       378      
Issuance of restricted shares                                       14 14
Issuance of common shares in connection with restricted stock award to employee (in shares)                                       4      
Issuance of common shares in connection with restricted stock award to employee                                      
Net loss                                       (7,956) (7,956)
Stock offering, net of issuance costs (in shares)             0 1,004,171     1,004,171                        
Stock offering, net of issuance costs               $ 6,322 $ 6,322                        
Reverse stock split - cancellation and payout of fractional shares (in shares)                                       (688)      
Reverse stock split - cancellation and payout of fractional shares                                       (5) (5)
Balances (in shares) at Sep. 30, 2019                                       1,469,789      
Balances at Sep. 30, 2019                                       $ 168,304 $ (183,094) $ (14,790)
[1] The condensed consolidated balance sheet as of December 31, 2018 has been derived from the audited consolidated financial statements as of that date.