|
BALANCE SHEETS (Parenthetical) (USD $)
|
Dec. 31, 2014
|
Dec. 31, 2013
|
| Stockholders' equity: |
|
|
| Preferred Stock, par value (in dollars per share) |
$ 0.01 |
$ 0.01 |
| Preferred Stock, shares authorized (in shares) |
5,000,000 |
5,000,000 |
| Series A Junior Participating Preferred Stock, shares authorized (in shares) |
25,000 |
25,000 |
| Preferred Stock, shares issued (in shares) |
0 |
0 |
| Preferred Stock, shares outstanding (in shares) |
0 |
0 |
| Common stock, par value (in dollars per share) |
$ 0.001 |
$ 0.001 |
| Common stock, shares authorized (in shares) |
250,000,000 |
250,000,000 |
| Common stock, shares issued (in shares) |
55,921,986 |
42,116,964 |
| Common stock, shares outstanding (in shares) |
55,921,986 |
42,116,964 |
| Treasury stock (in shares) |
199,275 |
143,796 |