Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions |
Jun. 30, 2015 |
Dec. 31, 2014 |
| Preferred stock, shares authorized |
136,074,466
|
135,913,741
|
| Preferred stock, shares issued |
17,357,903
|
17,266,628
|
| Preferred stock, shares outstanding |
17,357,903
|
17,266,628
|
| Common stock, par value |
$ 0.001
|
$ 0.001
|
| Common stock, shares authorized |
180,000,000
|
180,000,000
|
| Common stock, shares issued |
1,616,514
|
1,588,701
|
| Common stock, shares outstanding |
1,616,514
|
1,588,701
|
| Convertible Preferred Stock [Member] |
|
|
| Preferred stock, par value |
$ 0.001
|
$ 0.001
|
| Preferred stock, shares authorized |
1,843,894
|
1,843,894
|
| Preferred stock, shares issued |
224,564
|
224,564
|
| Preferred stock, shares outstanding |
224,564
|
224,564
|
| Preferred stock, aggregate liquidation preference |
$ 2.5
|
$ 2.5
|
| Redeemable Convertible Preferred Stock [Member] |
|
|
| Preferred stock, par value |
$ 0.001
|
$ 0.001
|
| Preferred stock, shares authorized |
134,230,572
|
134,069,847
|
| Preferred stock, shares issued |
17,133,339
|
17,042,064
|
| Preferred stock, shares outstanding |
17,133,339
|
17,042,064
|
| Preferred stock, aggregate liquidation preference |
$ 107.9
|
$ 103.5
|