CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares |
12 Months Ended | |
|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Stockholders' equity: | ||
| Preferred stock, shares authorized | 10,000,000 | |
| Common stock, par value (in dollars per share) | $ 0.001 | $ 0.001 |
| Common stock, shares authorized | 40,000,000 | 40,000,000 |
| Common stock, shares issued | 31,002,832 | 27,194,251 |
| Common stock, shares outstanding | 30,859,753 | 27,051,172 |
| Series A Preferred Stock | ||
| Stockholders' equity: | ||
| Preferred stock, par value (in dollars per share) | $ 0.001 | $ 0.001 |
| Preferred stock, shares authorized | 3,500,000 | 3,500,000 |
| Preferred stock, shares issued | 0 | 0 |
| Preferred stock, shares outstanding | 0 | 0 |
| Preferred stock, dividend rate (as a percent) | 6.00% | 6.00% |
| Series B Preferred Stock | ||
| Stockholders' equity: | ||
| Preferred stock, par value (in dollars per share) | $ 0.001 | $ 0.001 |
| Preferred stock, shares authorized | 3,588,139 | 3,588,139 |
| Preferred stock, shares issued | 975,639 | 1,975,639 |
| Preferred stock, shares outstanding | 975,639 | 1,975,639 |