Condensed Consolidated Statement of Changes in Shareholders' Equity (unaudited) - USD ($)
$ in Thousands |
Class A Common Stock |
Additional Paid - in Capital |
Accumulated Deficit |
Total |
Mezzanine Equity |
| Balances at Dec. 31, 2017 |
$ 8
|
$ 206,640
|
$ (200,482)
|
$ 6,166
|
|
| Balances (in shares) at Dec. 31, 2017 |
8,151,845
|
|
|
|
|
| Increase (Decrease) in Stockholders' Equity [Roll Forward] |
|
|
|
|
|
| Proceeds from common stock offering and warrant exercises, net of costs |
|
1,524
|
|
$ 1,524
|
|
| Proceeds from common stock offering and warrant exercises, net of costs (in shares) |
1,600,000
|
|
|
|
|
| Common stock issued to settle proxy contest (in shares) |
600,000
|
|
|
0
|
|
| Net loss |
|
|
(4,334)
|
$ (4,334)
|
|
| Balances at Mar. 31, 2018 |
$ 8
|
208,164
|
(204,816)
|
3,356
|
|
| Balances (in shares) at Mar. 31, 2018 |
10,351,845
|
|
|
|
|
| Balances at Dec. 31, 2017 |
$ 8
|
206,640
|
(200,482)
|
6,166
|
|
| Balances (in shares) at Dec. 31, 2017 |
8,151,845
|
|
|
|
|
| Increase (Decrease) in Stockholders' Equity [Roll Forward] |
|
|
|
|
|
| Net loss |
|
|
|
(12,096)
|
|
| Balances at Jun. 30, 2018 |
$ 9
|
212,446
|
(212,578)
|
(123)
|
|
| Balances (in shares) at Jun. 30, 2018 |
15,661,398
|
|
|
|
|
| Balances at Mar. 31, 2018 |
$ 8
|
208,164
|
(204,816)
|
3,356
|
|
| Balances (in shares) at Mar. 31, 2018 |
10,351,845
|
|
|
|
|
| Increase (Decrease) in Stockholders' Equity [Roll Forward] |
|
|
|
|
|
| Conversion of 2018 Notes |
$ 1
|
3,821
|
|
3,822
|
|
| Conversion of 2018 Notes (in shares) |
5,109,553
|
|
|
|
|
| Proceeds from warrant exercises related to 2018 Note Offering |
|
373
|
|
373
|
|
| Proceeds from warrant exercises related to 2018 Note Offering (in shares) |
200,000
|
|
|
|
|
| Share-based compensation |
|
88
|
|
88
|
|
| Net loss |
|
|
(7,762)
|
(7,762)
|
|
| Balances at Jun. 30, 2018 |
$ 9
|
212,446
|
(212,578)
|
(123)
|
|
| Balances (in shares) at Jun. 30, 2018 |
15,661,398
|
|
|
|
|
| Balances at Dec. 31, 2018 |
$ 17
|
253,331
|
(242,566)
|
10,782
|
|
| Balances (in shares) at Dec. 31, 2018 |
91,859,638
|
|
|
|
|
| Increase (Decrease) in Stockholders' Equity [Roll Forward] |
|
|
|
|
|
| Conversion of 2018 Notes |
$ 0
|
421
|
|
421
|
|
| Conversion of 2018 Notes (in shares) |
894,836
|
|
|
|
|
| Proceeds from warrant exercises related to 2018 Note Offering |
|
309
|
|
309
|
|
| Proceeds from warrant exercises related to 2018 Note Offering (in shares) |
210,000
|
|
|
|
|
| Share-based compensation |
|
78
|
|
78
|
|
| Adoption of lease accounting standard |
|
|
37
|
37
|
|
| Net loss |
|
|
(4,490)
|
(4,490)
|
|
| Balances at Mar. 31, 2019 |
$ 17
|
254,139
|
(247,019)
|
7,137
|
|
| Balances (in shares) at Mar. 31, 2019 |
92,964,474
|
|
|
|
|
| Balance at Mar. 31, 2019 |
|
|
|
|
$ 0
|
| Balances at Dec. 31, 2018 |
$ 17
|
253,331
|
(242,566)
|
10,782
|
|
| Balances (in shares) at Dec. 31, 2018 |
91,859,638
|
|
|
|
|
| Increase (Decrease) in Stockholders' Equity [Roll Forward] |
|
|
|
|
|
| Conversion of 2018 Notes (in shares) |
894,836
|
|
|
|
|
| Net loss |
|
|
|
(9,566)
|
|
| Balances at Jun. 30, 2019 |
$ 19
|
255,715
|
(252,144)
|
3,590
|
|
| Balances (in shares) at Jun. 30, 2019 |
114,021,830
|
|
|
|
|
| Balance at Jun. 30, 2019 |
|
|
|
195
|
195
|
| Balances at Mar. 31, 2019 |
$ 17
|
254,139
|
(247,019)
|
7,137
|
|
| Balances (in shares) at Mar. 31, 2019 |
92,964,474
|
|
|
|
|
| Balance at Mar. 31, 2019 |
|
|
|
|
0
|
| Increase (Decrease) in Stockholders' Equity [Roll Forward] |
|
|
|
|
|
| Warrant exercises related to 2019 Offering |
|
1,598
|
|
1,598
|
|
| Warrant exercises related to 2019 Offering (in shares) |
5,119,076
|
|
|
|
|
| Share-based compensation |
|
59
|
|
59
|
|
| Common stock offering, net of warrant liability and offering costs |
$ 2
|
114
|
|
116
|
|
| Common stock offering, net of warrant liability and offering costs (in shares) |
15,938,280
|
|
|
|
|
| Adoption of lease accounting standard |
|
|
(49)
|
(49)
|
|
| Net loss |
|
|
(5,076)
|
(5,076)
|
|
| Redeemable placement agent common stock warrants |
|
(195)
|
|
(195)
|
195
|
| Balances at Jun. 30, 2019 |
$ 19
|
$ 255,715
|
$ (252,144)
|
3,590
|
|
| Balances (in shares) at Jun. 30, 2019 |
114,021,830
|
|
|
|
|
| Balance at Jun. 30, 2019 |
|
|
|
$ 195
|
$ 195
|