Business, Liquidity and Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Liabilities:
Fair value liability for price adjustable warrants	$ 2,469	$ 4,169
Fair value liability for shares to be issued	523	901
Fair value on recurring basis
Liabilities:
Fair value liability for price adjustable warrants	2,469	4,169
Fair value liability for shares to be issued	523	901
Total liabilities at fair value	2,992	5,070
Fair value on recurring basis | Level 1
Liabilities:
Fair value liability for price adjustable warrants
Fair value liability for shares to be issued	523	901
Total liabilities at fair value	523	901
Fair value on recurring basis | Level 2
Liabilities:
Fair value liability for price adjustable warrants
Fair value liability for shares to be issued
Total liabilities at fair value
Fair value on recurring basis | Level 3
Liabilities:
Fair value liability for price adjustable warrants	2,469	4,169
Fair value liability for shares to be issued
Total liabilities at fair value	$ 2,469	$ 4,169