Condensed Consolidated Statement of Changes in Shareholders' Equity (unaudited) - USD ($)
|
Class A Common Stock |
Additional Paid-in Capital |
Accumulated Deficit |
Mezzanine Equity |
Total |
| Balances at Dec. 31, 2017 |
$ 8,000
|
$ 206,640,000
|
$ (200,482,000)
|
|
$ 6,166,000
|
| Balances (in shares) at Dec. 31, 2017 |
8,151,845
|
|
|
|
|
| Increase (Decrease) in Stockholders' Equity |
|
|
|
|
|
| Proceeds from common stock offering and warrant exercises, net of costs |
|
1,524,000
|
|
|
1,524,000
|
| 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
|
|
|
|
|
| Net loss |
|
|
(4,334,000)
|
|
(4,334,000)
|
| Balances at Mar. 31, 2018 |
$ 8,000
|
208,164,000
|
(204,816,000)
|
|
3,356,000
|
| Balances (in shares) at Mar. 31, 2018 |
10,351,845
|
|
|
|
|
| Balances at Dec. 31, 2017 |
$ 8,000
|
206,640,000
|
(200,482,000)
|
|
6,166,000
|
| Balances (in shares) at Dec. 31, 2017 |
8,151,845
|
|
|
|
|
| Increase (Decrease) in Stockholders' Equity |
|
|
|
|
|
| Net loss |
|
|
|
|
(30,392,000)
|
| Balances at Sep. 30, 2018 |
$ 13,000
|
237,493,000
|
(230,874,000)
|
|
6,632,000
|
| Balances (in shares) at Sep. 30, 2018 |
57,191,766
|
|
|
|
|
| Balances at Mar. 31, 2018 |
$ 8,000
|
208,164,000
|
(204,816,000)
|
|
3,356,000
|
| Balances (in shares) at Mar. 31, 2018 |
10,351,845
|
|
|
|
|
| Increase (Decrease) in Stockholders' Equity |
|
|
|
|
|
| Conversion of 2018 Notes, net of costs |
$ 1,000
|
3,821,000
|
|
|
3,822,000
|
| Conversion of 2018 Notes, net of costs (in shares) |
5,109,553
|
|
|
|
|
| Proceeds from warrant exercises related to 2018 Note Offering |
|
373,000
|
|
|
373,000
|
| Proceeds from warrant exercises related to 2018 Note Offering (in shares) |
200,000
|
|
|
|
|
| Share-based compensation |
|
88,000
|
|
|
88,000
|
| Net loss |
|
|
(7,762,000)
|
|
(7,762,000)
|
| Balances at Jun. 30, 2018 |
$ 9,000
|
212,446,000
|
(212,578,000)
|
|
(123,000)
|
| Balances (in shares) at Jun. 30, 2018 |
15,661,398
|
|
|
|
|
| Increase (Decrease) in Stockholders' Equity |
|
|
|
|
|
| Conversion of 2018 Notes, net of costs |
$ 3,000
|
13,239,000
|
|
|
13,242,000
|
| Conversion of 2018 Notes, net of costs (in shares) |
34,338,700
|
|
|
|
|
| Proceeds from warrant exercises related to 2018 Note Offering |
$ 1,000
|
11,718,000
|
|
|
11,719,000
|
| Proceeds from warrant exercises related to 2018 Note Offering (in shares) |
7,191,668
|
|
|
|
|
| Share-based compensation |
|
90,000
|
|
|
90,000
|
| Net loss |
|
|
(18,296,000)
|
|
(18,296,000)
|
| Balances at Sep. 30, 2018 |
$ 13,000
|
237,493,000
|
(230,874,000)
|
|
6,632,000
|
| Balances (in shares) at Sep. 30, 2018 |
57,191,766
|
|
|
|
|
| Balances at Dec. 31, 2018 |
$ 17,000
|
253,331,000
|
(242,566,000)
|
|
10,782,000
|
| Balances (in shares) at Dec. 31, 2018 |
91,859,638
|
|
|
|
|
| Increase (Decrease) in Stockholders' Equity |
|
|
|
|
|
| Conversion of 2018 Notes, net of costs |
|
421,000
|
|
|
421,000
|
| Conversion of 2018 Notes, net of costs (in shares) |
894,836
|
|
|
|
|
| Proceeds from warrant exercises related to 2018 Note Offering |
|
309,000
|
|
|
309,000
|
| Proceeds from warrant exercises related to 2018 Note Offering (in shares) |
210,000
|
|
|
|
|
| Share-based compensation |
$ 0
|
78,000
|
0
|
$ 0
|
78,000
|
| Adoption of lease accounting standard |
|
|
37,000
|
|
37,000
|
| Net loss |
|
|
(4,490,000)
|
|
(4,490,000)
|
| Balances at Mar. 31, 2019 |
$ 17,000
|
254,139,000
|
(247,019,000)
|
|
7,137,000
|
| Balances (in shares) at Mar. 31, 2019 |
92,964,474
|
|
|
|
|
| Balances at Dec. 31, 2018 |
$ 17,000
|
253,331,000
|
(242,566,000)
|
|
10,782,000
|
| Balances (in shares) at Dec. 31, 2018 |
91,859,638
|
|
|
|
|
| Increase (Decrease) in Stockholders' Equity |
|
|
|
|
|
| Conversion of 2018 Notes, net of costs (in shares) |
894,836
|
|
|
|
|
| Net loss |
|
|
|
|
(11,377,000)
|
| Balances at Sep. 30, 2019 |
$ 19,000
|
258,466,000
|
(253,946,000)
|
195,000
|
4,539,000
|
| Balances (in shares) at Sep. 30, 2019 |
119,029,994
|
|
|
|
|
| Balances at Mar. 31, 2019 |
$ 17,000
|
254,139,000
|
(247,019,000)
|
|
7,137,000
|
| Balances (in shares) at Mar. 31, 2019 |
92,964,474
|
|
|
|
|
| Increase (Decrease) in Stockholders' Equity |
|
|
|
|
|
| Warrant exercises related to 2019 Offering |
|
1,598,000
|
|
|
1,598,000
|
| Warrant exercises related to 2019 Offering (in shares) |
5,119,076
|
|
|
|
|
| Share-based compensation |
|
59,000
|
|
|
59,000
|
| Common stock offering, net of warrant liability and offering costs |
$ 2,000
|
114,000
|
|
|
116,000
|
| Common stock offering, net of warrant liability and offering costs (in shares) |
15,938,280
|
|
|
|
|
| Adoption of lease accounting standard |
|
|
(49,000)
|
|
(49,000)
|
| Redeemable placement agent common stock warrants |
|
(195,000)
|
|
195,000
|
(195,000)
|
| Net loss |
|
|
(5,076,000)
|
|
(5,076,000)
|
| Balances at Jun. 30, 2019 |
$ 19,000
|
255,715,000
|
(252,144,000)
|
195,000
|
3,590,000
|
| Balances (in shares) at Jun. 30, 2019 |
114,021,830
|
|
|
|
|
| Increase (Decrease) in Stockholders' Equity |
|
|
|
|
|
| Warrant exercises related to 2019 Offering |
|
2,713,000
|
|
|
2,713,000
|
| Warrant exercises related to 2019 Offering (in shares) |
5,008,164
|
|
|
|
|
| Share-based compensation |
|
58,000
|
|
|
58,000
|
| Common stock offering, net of warrant liability and offering costs |
|
(20,000)
|
|
|
(20,000)
|
| Adoption of lease accounting standard |
|
|
9,000
|
|
9,000
|
| Net loss |
|
|
(1,811,000)
|
|
(1,811,000)
|
| Balances at Sep. 30, 2019 |
$ 19,000
|
$ 258,466,000
|
$ (253,946,000)
|
$ 195,000
|
$ 4,539,000
|
| Balances (in shares) at Sep. 30, 2019 |
119,029,994
|
|
|
|
|