|
Income Taxes (Details) (USD $)
|
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|
| Income Taxes | |||
| Provision for income taxes | $ 0 | $ 0 | $ 0 |
| Deferred tax assets, before valuation allowance | 34,208,000 | 22,804,000 | 14,400,000 |
| Net operating loss carryforwards | |||
| NOLs related to excess tax benefits | 500,000 | ||
| Federal | |||
| Net operating loss carryforwards | |||
| Net operating loss carryforwards | 95,100,000 | 62,300,000 | 40,500,000 |
| State | |||
| Net operating loss carryforwards | |||
| Net operating loss carryforwards | $ 16,600,000 | $ 33,100,000 | $ 11,300,000 |