Consolidated Statements of Stockholder's Equity (Unaudited) - USD ($) $ in Thousands |
Total |
June 2018 Public Offering [Member] |
LPC [Member] |
Common stock [Member] |
Common stock [Member]
June 2018 Public Offering [Member]
|
Common stock [Member]
LPC [Member]
|
Preferred stock [Member] |
Preferred stock [Member]
June 2018 Public Offering [Member]
|
Additional paid-in capital [Member] |
Additional paid-in capital [Member]
June 2018 Public Offering [Member]
|
Additional paid-in capital [Member]
LPC [Member]
|
Accumulated other comprehensive income (loss) [Member] |
Accumulated deficit [Member] |
Beginning Balance at Dec. 31, 2017 |
$ 7,879
|
|
|
$ 12
|
|
|
|
|
$ 20,556
|
|
|
$ 5
|
$ (12,694)
|
Beginning Balance, Shares at Dec. 31, 2017 |
|
|
|
1,194,793
|
|
|
|
|
|
|
|
|
|
Stock-based compensation expense |
181
|
|
|
|
|
|
|
|
181
|
|
|
|
|
Shares issued |
|
|
$ 1,104
|
|
|
$ 1
|
|
|
|
|
$ 1,103
|
|
|
Shares issued, Shares |
|
|
|
|
|
80,000
|
|
|
|
|
|
|
|
Net loss |
(3,022)
|
|
|
|
|
|
|
|
|
|
|
|
(3,022)
|
Ending Balance at Mar. 31, 2018 |
6,142
|
|
|
$ 13
|
|
|
|
|
21,840
|
|
|
5
|
(15,716)
|
Ending Balance, Shares at Mar. 31, 2018 |
|
|
|
1,274,793
|
|
|
|
|
|
|
|
|
|
Beginning Balance at Dec. 31, 2017 |
$ 7,879
|
|
|
$ 12
|
|
|
|
|
20,556
|
|
|
5
|
(12,694)
|
Beginning Balance, Shares at Dec. 31, 2017 |
|
|
|
1,194,793
|
|
|
|
|
|
|
|
|
|
Restricted stock unit settlements, Shares |
5,340
|
|
|
|
|
|
|
|
|
|
|
|
|
Net loss |
$ (9,050)
|
|
|
|
|
|
|
|
|
|
|
|
|
Ending Balance at Sep. 30, 2018 |
14,164
|
|
|
$ 16
|
|
|
|
|
35,887
|
|
|
5
|
(21,744)
|
Ending Balance, Shares at Sep. 30, 2018 |
|
|
|
4,901,095
|
|
|
652
|
|
|
|
|
|
|
Beginning Balance at Mar. 31, 2018 |
6,142
|
|
|
$ 13
|
|
|
|
|
21,840
|
|
|
5
|
(15,716)
|
Beginning Balance, Shares at Mar. 31, 2018 |
|
|
|
1,274,793
|
|
|
|
|
|
|
|
|
|
Stock-based compensation expense |
197
|
|
|
|
|
|
|
|
197
|
|
|
|
|
Shares issued |
|
$ 12,194
|
174
|
|
$ 1
|
|
|
|
|
$ 12,193
|
174
|
|
|
Shares issued, Shares |
|
|
|
|
1,160,500
|
16,000
|
|
9,158
|
|
|
|
|
|
Shares issued on conversion of preferred shares |
3
|
|
|
$ 1
|
|
|
|
|
2
|
|
|
|
|
Shares issued on conversion of preferred shares, Shares |
|
|
|
1,656,750
|
|
|
(6,627)
|
|
|
|
|
|
|
Shares issued on exercise of warrants |
520
|
|
|
|
|
|
|
|
520
|
|
|
|
|
Shares issued on exercise of warrants, Shares |
|
|
|
130,500
|
|
|
|
|
|
|
|
|
|
Adjustment of fractional shares on reverse stock split, Shares |
|
|
|
(17)
|
|
|
|
|
|
|
|
|
|
Net loss |
(2,788)
|
|
|
|
|
|
|
|
|
|
|
|
(2,788)
|
Ending Balance at Jun. 30, 2018 |
$ 16,442
|
|
|
$ 15
|
|
|
|
|
34,926
|
|
|
5
|
(18,504)
|
Ending Balance, Shares at Jun. 30, 2018 |
|
|
|
4,238,526
|
|
|
2,531
|
|
|
|
|
|
|
Restricted stock unit settlements, Shares |
5,340
|
|
|
5,319
|
|
|
|
|
|
|
|
|
|
Stock-based compensation expense |
$ 210
|
|
|
|
|
|
|
|
210
|
|
|
|
|
Shares issued |
|
|
2
|
|
|
|
|
|
|
|
2
|
|
|
Shares issued on conversion of preferred shares |
(4)
|
|
|
$ 1
|
|
|
|
|
(5)
|
|
|
|
|
Shares issued on conversion of preferred shares, Shares |
|
|
|
469,750
|
|
|
(1,879)
|
|
|
|
|
|
|
Shares issued on exercise of warrants |
754
|
|
|
|
|
|
|
|
754
|
|
|
|
|
Shares issued on exercise of warrants, Shares |
|
|
|
187,500
|
|
|
|
|
|
|
|
|
|
Net loss |
(3,240)
|
|
|
|
|
|
|
|
|
|
|
|
(3,240)
|
Ending Balance at Sep. 30, 2018 |
14,164
|
|
|
$ 16
|
|
|
|
|
35,887
|
|
|
5
|
(21,744)
|
Ending Balance, Shares at Sep. 30, 2018 |
|
|
|
4,901,095
|
|
|
652
|
|
|
|
|
|
|
Beginning Balance at Dec. 31, 2018 |
15,802
|
|
|
$ 18
|
|
|
|
|
41,161
|
|
|
4
|
(25,381)
|
Beginning Balance, Shares at Dec. 31, 2018 |
|
|
|
6,721,117
|
|
|
579
|
|
|
|
|
|
|
Restricted stock unit settlements, Shares |
|
|
|
83
|
|
|
|
|
|
|
|
|
|
Stock-based compensation expense |
290
|
|
|
|
|
|
|
|
290
|
|
|
|
|
Adjustments to final October 2018 financing costs |
4
|
|
|
|
|
|
|
|
4
|
|
|
|
|
Cumulative adjustment on adoption of lease standard | ASU 2016-02 [Member] |
(3)
|
|
|
|
|
|
|
|
|
|
|
|
(3)
|
Net loss |
(5,904)
|
|
|
|
|
|
|
|
|
|
|
|
(5,904)
|
Ending Balance at Mar. 31, 2019 |
10,189
|
|
|
$ 18
|
|
|
|
|
41,455
|
|
|
4
|
(31,288)
|
Ending Balance, Shares at Mar. 31, 2019 |
|
|
|
6,721,200
|
|
|
579
|
|
|
|
|
|
|
Beginning Balance at Dec. 31, 2018 |
$ 15,802
|
|
|
$ 18
|
|
|
|
|
41,161
|
|
|
4
|
(25,381)
|
Beginning Balance, Shares at Dec. 31, 2018 |
|
|
|
6,721,117
|
|
|
579
|
|
|
|
|
|
|
Restricted stock unit settlements, Shares |
5,134
|
|
|
|
|
|
|
|
|
|
|
|
|
Net loss |
$ (13,201)
|
|
|
|
|
|
|
|
|
|
|
|
|
Ending Balance at Sep. 30, 2019 |
8,141
|
|
|
$ 19
|
|
|
|
|
50,628
|
|
|
4
|
(42,510)
|
Ending Balance, Shares at Sep. 30, 2019 |
|
|
|
8,102,764
|
|
|
|
|
|
|
|
|
|
Beginning Balance at Mar. 31, 2019 |
10,189
|
|
|
$ 18
|
|
|
|
|
41,455
|
|
|
4
|
(31,288)
|
Beginning Balance, Shares at Mar. 31, 2019 |
|
|
|
6,721,200
|
|
|
579
|
|
|
|
|
|
|
Stock-based compensation expense |
317
|
|
|
|
|
|
|
|
317
|
|
|
|
|
Shares issued |
|
|
$ 423
|
|
|
|
|
|
|
|
$ 423
|
|
|
Shares issued, Shares |
|
|
|
|
|
124,000
|
|
|
|
|
|
|
|
Shares issued on conversion of preferred shares, Shares |
|
|
|
144,750
|
|
|
(579)
|
|
|
|
|
|
|
Shares issued on exercise of warrants |
4,199
|
|
|
$ 1
|
|
|
|
|
4,198
|
|
|
|
|
Shares issued on exercise of warrants, Shares |
|
|
|
1,107,813
|
|
|
|
|
|
|
|
|
|
Issuance of inducement warrants |
|
|
|
|
|
|
|
|
3,925
|
|
|
|
(3,925)
|
Net loss |
(3,624)
|
|
|
|
|
|
|
|
|
|
|
|
(3,624)
|
Ending Balance at Jun. 30, 2019 |
$ 11,504
|
|
|
$ 19
|
|
|
|
|
50,318
|
|
|
4
|
(38,837)
|
Ending Balance, Shares at Jun. 30, 2019 |
|
|
|
8,097,763
|
|
|
|
|
|
|
|
|
|
Restricted stock unit settlements, Shares |
5,134
|
|
|
5,001
|
|
|
|
|
|
|
|
|
|
Stock-based compensation expense |
$ 310
|
|
|
|
|
|
|
|
310
|
|
|
|
|
Net loss |
(3,673)
|
|
|
|
|
|
|
|
|
|
|
|
(3,673)
|
Ending Balance at Sep. 30, 2019 |
$ 8,141
|
|
|
$ 19
|
|
|
|
|
$ 50,628
|
|
|
$ 4
|
$ (42,510)
|
Ending Balance, Shares at Sep. 30, 2019 |
|
|
|
8,102,764
|
|
|
|
|
|
|
|
|
|