Summary of Significant Accounting Policies - Stock option equivalents (Details) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Summary of the approximate number of common stock equivalents outstanding
Total number of common stock equivalents outstanding	10,710	11,238
Options [Member]
Summary of the approximate number of common stock equivalents outstanding
Total number of common stock equivalents outstanding	1,890	2,204
Warrants [Member]
Summary of the approximate number of common stock equivalents outstanding
Total number of common stock equivalents outstanding	1,083	1,083
Option matching rights [Member]
Summary of the approximate number of common stock equivalents outstanding
Total number of common stock equivalents outstanding	999	1,276
Shares to be issued upon conversion of convertible of long-term loan, related party [Member]
Summary of the approximate number of common stock equivalents outstanding
Total number of common stock equivalents outstanding	6,575	6,575
Restricted stock [Member]
Summary of the approximate number of common stock equivalents outstanding
Total number of common stock equivalents outstanding	163	100