Note N - Net Loss Per Share - Anti-dilutive Securities (Details) - shares
|
12 Months Ended |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
| Series A (in shares) |
10,869,947
|
5,714,113
|
10,430,981
|
| Warrants to Purchase Common Stock [Member] |
|
|
|
| Series A (in shares) |
2,087,477
|
2,325,383
|
595,920
|
| Deerfield Warrant to Purchase Series D Preferred Stock [Member] |
|
|
|
| Series A (in shares) |
|
|
2,066,970
|
| Stock Compensation Plan [Member] |
|
|
|
| Series A (in shares) |
1,990,260
|
1,397,511
|
395,185
|
| Convertible Debt Securities [Member] |
|
|
|
| Series A (in shares) |
1,751,296
|
1,991,219
|
1,808,353
|
| 2021 Notes [Member] |
|
|
|
| Series A (in shares) |
5,040,914
|
|
|
| Series A Redeemable Convertible Preferred Stock [Member] |
|
|
|
| Series A (in shares) |
|
|
1,293,838
|
| Series B Redeemable Convertible Preferred Stock [Member] |
|
|
|
| Series A (in shares) |
|
|
829,234
|
| Series C Redeemable Convertible Preferred Stock [Member] |
|
|
|
| Series A (in shares) |
|
|
2,474,122
|
| Series D Redeemable Convertible Preferred Stock [Member] |
|
|
|
| Series A (in shares) |
|
|
967,359
|
| Redeemable Convertible Preferred Stock [Member] |
|
|
|
| Series A (in shares) |
|
|
5,564,553
|