Number of Warrants | Weighted Average Exercise Price | |||||
Common stock warrants outstanding as of December 31, 2012 | 10.0 | $ | 32.50 | |||
Cashless exercise | (4.8 | ) | 32.50 | |||
Cash exercise | (2.3 | ) | 32.50 | |||
Common stock warrants outstanding as of December 31, 2013 | 2.9 | 32.50 | ||||
Cashless exercise | (1.8 | ) | 32.16 | |||
Cash exercise | (1.0 | ) | 32.16 | |||
Expired | (0.1 | ) | 32.16 | |||
Common stock warrants outstanding as of January 16, 2014 | — |