CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) |
Total |
Warrants Exercise One [Member] |
Warrants Exercise Two [Member] |
Common Stock Issuance One [Member] |
Common Stock Issuance Two [Member] |
Employees and Directors [Member] |
Common Stock [Member] |
Common Stock [Member]
Warrants Exercise One [Member]
|
Common Stock [Member]
Warrants Exercise Two [Member]
|
Common Stock [Member]
Common Stock Issuance One [Member]
|
Common Stock [Member]
Common Stock Issuance Two [Member]
|
Common Stock [Member]
Employees and Directors [Member]
|
Additional Paid-in Capital [Member] |
Additional Paid-in Capital [Member]
Warrants Exercise One [Member]
|
Additional Paid-in Capital [Member]
Warrants Exercise Two [Member]
|
Additional Paid-in Capital [Member]
Common Stock Issuance One [Member]
|
Additional Paid-in Capital [Member]
Common Stock Issuance Two [Member]
|
Additional Paid-in Capital [Member]
Employees and Directors [Member]
|
Accumulated deficit [Member] |
Accumulated deficit [Member]
Warrants Exercise One [Member]
|
Accumulated deficit [Member]
Warrants Exercise Two [Member]
|
Accumulated deficit [Member]
Common Stock Issuance One [Member]
|
Accumulated deficit [Member]
Common Stock Issuance Two [Member]
|
Accumulated deficit [Member]
Employees and Directors [Member]
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Balance at Dec. 31, 2015 | $ 67,721,000 | $ 328,000 | $ 377,993,000 | $ (310,600,000) | ||||||||||||||||||||
| Balance (in shares) at Dec. 31, 2015 | 32,743,013 | |||||||||||||||||||||||
| Restricted common stock issued | 150,000 | $ 3,432,000 | $ 0 | $ 1,000 | 150,000 | $ 3,431,000 | 0 | $ 0 | ||||||||||||||||
| Restricted common stock issued (in shares) | 52,690 | 100,000 | ||||||||||||||||||||||
| Exercise of $5.00 warrants | $ 0 | $ 0 | $ 0 | $ 0 | ||||||||||||||||||||
| Exercise of $5.00 warrants (in shares) | 5,836 | |||||||||||||||||||||||
| Common stock issued for services | 2,452,000 | $ 8,000 | 2,444,000 | 0 | ||||||||||||||||||||
| Common stock issued for services (in shares) | 750,000 | |||||||||||||||||||||||
| Common stock issued for an average, net of costs | $ 969,000 | $ 41,068,000 | $ 2,000 | $ 63,000 | $ 967,000 | $ 41,005,000 | $ 0 | $ 0 | ||||||||||||||||
| Common stock issued for an average, net of costs (in shares) | 158,029 | 6,293,889 | ||||||||||||||||||||||
| Common stock issued for cash exercise of options | 350,000 | $ 1,000 | 349,000 | 0 | ||||||||||||||||||||
| Common stock issued for cash exercise of options (in shares) | 151,000 | |||||||||||||||||||||||
| Stock option compensation expense | 4,829,000 | $ 0 | 4,829,000 | 0 | ||||||||||||||||||||
| Net loss | (21,873,000) | 0 | 0 | (21,873,000) | ||||||||||||||||||||
| Balance at Dec. 31, 2016 | 99,098,000 | $ 403,000 | 431,168,000 | (332,473,000) | ||||||||||||||||||||
| Balance (in shares) at Dec. 31, 2016 | 40,254,457 | |||||||||||||||||||||||
| Restricted common stock issued | $ 1,272,000 | $ 0 | $ 1,272,000 | $ 0 | ||||||||||||||||||||
| Restricted common stock issued (in shares) | 0 | |||||||||||||||||||||||
| Exercise of $8.00 warrants | $ 5,000,000 | $ 6,000 | $ 4,994,000 | $ 0 | ||||||||||||||||||||
| Exercise of $8.00 warrants (in shares) | 625,000 | |||||||||||||||||||||||
| Exercise of $5.00 warrants | $ 885,000 | $ 2,000 | $ 883,000 | $ 0 | ||||||||||||||||||||
| Exercise of $5.00 warrants (in shares) | 176,932 | |||||||||||||||||||||||
| Common stock issued for an average, net of costs | $ 86,174,000 | $ 58,000 | $ 86,116,000 | $ 0 | ||||||||||||||||||||
| Common stock issued for an average, net of costs (in shares) | 5,750,000 | |||||||||||||||||||||||
| Common stock issued for cash exercise of options | 344,000 | $ 0 | 344,000 | 0 | ||||||||||||||||||||
| Common stock issued for cash exercise of options (in shares) | 81,719 | |||||||||||||||||||||||
| Stock option compensation expense | 4,644,000 | $ 0 | 4,644,000 | 0 | ||||||||||||||||||||
| Net loss | (27,319,000) | 0 | 0 | (27,319,000) | ||||||||||||||||||||
| Balance at Dec. 31, 2017 | $ 170,098,000 | $ 469,000 | $ 529,421,000 | $ (359,792,000) | ||||||||||||||||||||
| Balance (in shares) at Dec. 31, 2017 | 46,888,108 |