The ICO closed on November 18th 2013 and raised 21BTC from 72 investors which at the time was worth around $6000. The genesis block was published on 24 November 2013. The source code was partially released on 3 January. The full source code was released on 1 March 2014 under the MIT License.
Over the following weeks the ICO price of NXT increased from 2 satoshis to 16,000 Satoshis in January 2014.