Stockholders' Equity (Common Stock are Reserved for Future Issuance) (Details) - shares shares in Thousands	Jun. 30, 2017	Dec. 31, 2016
Equity [Abstract]
Warrants outstanding	19,557	2,570
Stock options outstanding	505	561
Options reserved for future issuance under the Company's 2007 Incentive Plan	466
Shares reserved for future issuance under the Employee Stock Purchase Plan	17
Total reserved for future issuance	20,545